shapesinfinity.
Learn AI · Beginner · 3 min

What is an algorithm?

Your phone knows how to unlock. Does it think?

Algorithm: Input to Output
Problem or dataRead the instructionsDo each step in orderMake a decisionGive the answerWrong steps = wrong answer

Data goes in. Computer follows steps. Answer comes out.

goes inthe AI workscomes outwatch out

In simple words

An algorithm is a step-by-step recipe that tells a computer what to do. Like following cooking steps: mix, heat, serve.

The real definition

An algorithm is a precise set of instructions a computer follows to solve a problem or complete a task. Algorithms are the foundation of all AI systems.

Like… Recipe comparison

An algorithm is like a cooking recipe: it lists exact steps in order. You follow step one, then two, then three, until food is ready. An algorithm works the same way inside computers.

But: Recipes can skip steps if you know how; algorithms cannot. Every step must happen in order.

You see it every day

on your phone

Unlock your phone

Your phone runs an algorithm to check if your fingerprint matches the saved one.

out in the world

Sorting library books

A library uses an algorithm to sort thousands of books by title or author.

at work

Ranking job applications

A company uses an algorithm to sort applications and find the best matches.

Step by step

  1. 1

    Write the problem clearly

    Describe exactly what you want the computer to solve.

  2. 2

    Break it into small steps

    Write simple instructions a computer can follow.

  3. 3

    Put steps in the right order

    Order matters. Step two depends on step one.

  4. 4

    Test with real data

    Run the algorithm and check if the answer is correct.

  5. 5

    Fix any mistakes

    Change steps that did not work and test again.

Remember

An algorithm is ordered instructions onlyComputers follow algorithms perfectly and quicklyAlgorithms solve problems step by stepWrong algorithms give wrong answers alwaysAll AI uses algorithms to work

Memory trick

Think A-L-G: Always List each step, then Go in order. No jumping around!

Words

Algorithm AL-go-rith-um
A set of clear steps a computer follows to solve a problem.
Instruction in-STRUK-shun
One clear command that tells the computer what to do.
Step step
One action in a sequence of actions.
Data DAY-tuh
Information the computer reads and uses.
Output OUT-put
The answer or result the computer gives you.
AI ay-eye
Computer programs that learn and solve problems like humans do.

Check yourself

quick check

What is an algorithm?

Hint

Think of a recipe with numbered steps.

quick check

You give a computer three steps to sort names. Step three depends on step one. What happens if you do step three first?

Hint

Order of cooking steps matters too.

think

Think of a daily task you do. Can you write it as three algorithm steps?

Show a good answer

Example: Making tea. Step one: heat water. Step two: pour water into cup. Step three: add tea bag and wait. Algorithms break tasks into clear, ordered steps.

Tell a friend

“An algorithm is a step-by-step recipe computers follow to solve problems.”

People also ask

Are algorithms and AI the same?

No. Algorithms are instructions. AI uses algorithms to learn and make decisions. All AI uses algorithms, but not all algorithms use AI.

Can an algorithm have mistakes?

Yes. If you write the steps wrong, the algorithm gives wrong answers. Testing and fixing algorithms is important work.

Do I need to be good at math to understand algorithms?

No. Algorithms are about clear thinking and order, not math. Anyone can learn to write and read algorithms.