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What Is an Algorithm? Definition, Traits, and Examples

Published: 21.06.2026·Updated: 15.10.2026

Fajar Hidayat

Coding Curriculum Team, Algonova

What Is an Algorithm? Definition, Traits, and Examples

An algorithm is a logical, systematic sequence of steps to solve a problem or reach a particular goal. The term doesn't belong only to computers — a cooking recipe, directions, and assembling a cabinet are all algorithms.

The word "algorithm" comes from the name of the 9th-century Persian mathematician Al-Khwarizmi. In programming, an algorithm is the core of every program: before writing code, a programmer designs the algorithm first.

What an Algorithm Is, Simply

Imagine explaining how to make tea to a robot:

Boil water
Put tea in a cup
Pour the hot water
Add sugar, then stir

This sequence is an algorithm — clear, ordered steps that produce a cup of tea. A computer works exactly the same way: it needs orderly, unambiguous instructions.

Three basic components of an algorithm:

Input: initial data or conditions (water, tea, sugar)
Process: the steps performed (boil, pour, stir)
Output: the final result (a cup of tea)

Traits of a Good Algorithm

According to the famous computer scientist Donald Knuth, a good algorithm has five traits:

Finiteness: it must stop after a number of steps, not loop forever.
Definiteness: every step is clear and unambiguous.
Input: it has zero or more inputs.
Output: it produces at least one output.
Effectiveness: every step is doable and reasonable.

A Simple Algorithm Example

An algorithm to find the largest of three numbers (a, b, c):

Assume a is the largest
If b is greater than a, then b is the largest
If c is greater than the current largest, then c is the largest
Show the largest number

For 5, 9, 7 → the result is 9. Simple logic like this is the basis of many computer programs, from games to shopping apps.

How to Represent an Algorithm

An algorithm can be written in three commonly used forms:

Form	Explanation	Best for
Natural language	Steps written in ordinary sentences	Beginners, first explanations
Flowchart	A flow diagram with symbols and arrows	Visualising logic
Pseudocode	Mock code resembling a programming language	Preparing to write code

Flowcharts use standard symbols: an oval for start/finish, a rectangle for a process, and a diamond for a decision (a yes/no condition).

For children who are just starting out, natural language and flowcharts are the easiest to grasp before moving on to pseudocode and real code. This is why platforms such as Scratch use visual blocks — children assemble an algorithm without having to type complicated code.

Algorithms teach children one valuable thing: any problem, however big, can be solved if you break it into small, clear steps.

Bayu Nugraha, Children's Coding Specialist

Algorithms in Programming

In coding, almost every program is an application of an algorithm. The three most basic algorithm patterns:

Sequence (order): steps run one after another from top to bottom.
Branching (conditions): the program takes a different path depending on a condition — for example "if the score is ≥ 75, display 'Pass'".
Looping (loops): steps are repeated a number of times — for example printing the numbers 1 to 10.

An example of an algorithm with a loop in Python that prints the numbers 1–5:

for i in range(1, 6): print(i)

The computer runs this algorithm and displays 1, 2, 3, 4, 5. Understanding algorithms lets someone move between programming languages easily, because the logic is the same.

Types of Algorithms

Types of algorithm are grouped by how they work when solving a problem. Some of the most frequently used:

Sorting algorithms: arrange data from smallest to largest, such as bubble sort and quick sort.
Searching algorithms: find one specific item inside a large set of data.
Greedy: pick the most rewarding option at each step.
Divide and conquer: break a big problem into small parts, solve them one by one, then combine the results.
Recursive: a function that calls itself until a stopping condition is reached.

For children, these types are best introduced through simple examples, like sorting number cards from small to large or finding a friend's name in the class attendance list.

Why Children Should Learn Algorithms

Learning algorithmic thinking trains children to break big problems into small, ordered steps — a skill useful not only for coding, but also for maths and everyday life.

Children can start learning algorithms without a computer (called unplugged), for example by writing the steps for brushing teeth or making a simple flowchart. After that, they can move on to visual coding with Scratch.

Summary

An algorithm is a logical, systematic sequence of steps to solve a problem.
Three components: input, process, output.
Represented in natural language, a flowchart, or pseudocode.
In coding, algorithms use sequential, branching, and loop patterns.
Algorithmic thinking trains a child's logic, an important foundation for coding and maths.

Want your child to learn logical thinking through coding? See the Algonova coding courses, or jump straight into a free coding class: a 60-minute session at no cost.

Go deeper into algorithms with the Algonova Coding Glossary: programming logic, computational thinking, what is programming, variable, loop, and function. Explore every term in the Coding & Technology Glossary for Kids.

Frequently Asked Questions

Does Algonova teach coding for primary, junior high, and senior high kids?

Yes, Algonova Indonesia runs a full coding program for kids aged 5 to 17, covering kindergarten through senior high. It splits into three age tracks: Little Coders for ages 5 to 7 using visual block based coding, Junior Coders for ages 8 to 12 using Scratch and the fundamentals of programming logic, and Teen Coders for ages 13 to 17 using Python and game development. Every class is live online with certified teachers in small groups of up to 10 students. Kids build a real project from the first session rather than memorising syntax. Algonova has taught more than 1,000,000 students across 97 countries since 2016.

Is there a free trial class for kids coding?

Yes. For the coding track Algonova Indonesia offers a free 60 minute master class with no commitment. No credit card is needed and there is no auto subscription afterwards. Note that these 60 minutes are an introductory master class, not a regular lesson. A regular coding class runs 90 minutes. During the master class the child works directly with a certified teacher, tries the online learning platform, and finishes a first small project matched to their age. After the session parents receive a personal learning track recommendation plus a transparent explanation of program, schedule, and pricing from Rp 102,000 per lesson. To book, fill in the form on the website.

How many students are in one Algonova coding class?

Algonova Indonesia coding classes come in three formats: Private with one student per teacher, Mini group of 2 to 4 kids, and Group of 6 to 10 kids of similar age and level. The small group format exists because coding gets stuck on very specific lines of code, and a child needs a teacher who can look at their screen when it happens. In a Mini group the teacher checks each child's screen several times per session. The Private format is the most intensive and suits competition preparation, independent projects, or a child who wants to move faster than the group.

How much does kids coding at Algonova Indonesia cost?

Kids coding at Algonova Indonesia starts from Rp 102,000 per lesson. The price covers the live session with a certified teacher, digital learning materials, online platform access, and an official certificate once the child completes each program level. The starting rate is the same across all age tracks. The final quote depends only on class format, meaning Private, Mini, or Group, and on how many sessions per week you choose. Group is the most affordable option and Private is the most intensive. Full pricing is shared after the free master class and before formal enrolment, with no surprise fees. To get a quote, fill in the form on the website.

Is coding tutoring fully available online?

Yes, every Algonova Indonesia coding program runs fully online with live sessions taught by certified teachers, not recorded videos. Kids learn in real time in small groups, with live Q&A and code written alongside the teacher during the class. To join, a child needs a computer or laptop with a camera, a stable internet connection, and a headset. The Algonova platform runs directly in the browser, so no special software installation is required and no expensive machine is needed. Because everything is online, families anywhere in Indonesia can join and easily fit lessons around school.

What makes Algonova coding effective for Indonesian kids?

Three things make Algonova coding effective for Indonesian kids: project based learning, a staged track, and small groups. Every session produces something that runs and can be shown to a parent, which keeps motivation alive far longer than theory alone. The track climbs gradually from visual block based coding to Python, so a child never jumps into a text language before their logic is ready. Small groups of up to 10 students let the teacher adjust pace: faster kids get extra challenges and stuck kids get help inside the same session. The material also lines up with coding and artificial intelligence entering the Indonesian school curriculum.

What if my child has never written any code before?

That is fine, most Algonova students start from zero with no coding experience at all. Every new child begins with the free master class, where the teacher watches how they solve problems and picks the right starting point. Kids aged 5 to 7 start with visual block based coding and do not need to type fast yet. Older kids can start with Scratch and move up to Python once their logic is solid. All that is required is basic reading and curiosity. Parents do not need to understand programming to support the child, because every task is explained by the teacher during class.

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What Is an Algorithm? Definition, Traits, and Examples

What an Algorithm Is, Simply

Traits of a Good Algorithm

A Simple Algorithm Example

How to Represent an Algorithm

Algorithms in Programming

Types of Algorithms

Why Children Should Learn Algorithms

Summary

Related Terms in the Coding Glossary

Frequently Asked Questions

More from Blog:

Online Math Tutoring for SMP Students: How to Choose and What to Check in the Trial Class

Child Behind in Math in Grades 3-6: How to Check and an 8-Week Catch-Up Plan

Best Classes for Kids by Age: What to Choose at 5, 7, 9 and 12 in Indonesia

Traits of a Good Algorithm

A Simple Algorithm Example

How to Represent an Algorithm

Algorithms in Programming

Types of Algorithms

Why Children Should Learn Algorithms

Summary

Related Terms in the Coding Glossary

Frequently Asked Questions

More from Blog:

Online Math Tutoring for SMP Students: How to Choose and What to Check in the Trial Class

Child Behind in Math in Grades 3-6: How to Check and an 8-Week Catch-Up Plan

Best Classes for Kids by Age: What to Choose at 5, 7, 9 and 12 in Indonesia