An algorithm is the list of instructions and rules that a computer needs to do to complete a tasks.

Algorithms are in everything we do. But for those that aren’t inclined toward maths and programming, the term ‘algorithm’ is less than clear.

(In fact, the joke runs that developers use the word ‘algorithm’ when they don’t want to explain what they’ve done.)

So, you might have heard the term before, even used it. But what is an algorithm exactly?

What is an algorithm?

In essence, algorithms are simply a series of instructions that are followed, step by step, to do something useful or solve problem.  You could consider a cake recipe an algorithm for making a cake, for example.

In computing, algorithms provide computers with a successive guide to completing actions. They’re comprised of a precise list of instructions that outline exactly how to complete a task.

So, what is an algorithm? A good way to think of them is as mini instruction manuals telling computers how to complete a given task or manipulate given data.

How do computer algorithms work?

Computer algorithms work via input and output. They take the input and apply each each step of the algorithm to that information to generate an output.

For example, a search engine is an algorithm that takes a search query as an input and searches its database for items relevant to the words in the query. It then outputs the results.

You can easily visualise algorithms as a flowchart. The input leads to steps and questions that need handling in order. When each section of the flowchart is completed, the generated result is the output.