Loop

A loop is a control structure that allows a program to repeat an action multiple times.
Loops are useful when we want to perform the same instruction repeatedly, such as:

counting numbers
processing data
displaying repeated output

Without loops, we would have to write the same code over and over again.

Why Loops Are Important

Loops help make programs:

more efficient
shorter and cleaner
easier to maintain

Instead of repeating the same syntax many times, we only need to define:

what should be repeated
when the repetition should stop

How Loops Improve Efficiency

Using loops reduces:

duplicated code
execution time
human error

In general:

fewer instructions → faster execution
clearer logic → easier debugging

How Loops Work (Conceptually)

Every loop usually has:

a starting point
a condition that controls repetition
an action that is repeated
a way to stop

As long as the condition is true, the loop continues running.

Types of Loops

There are several kinds of loops in programming. In this section, we will focus on two common ones:

For Loop Used when the number of repetitions is known in advance.
While Loop Used when repetition depends on a condition that is checked during execution.

Each type has its own use case and strengths.

Example (Concept Only)

Instead of writing:

print message
print message
print message

We can use a loop to repeat the instruction automatically.
The exact syntax depends on the programming language, which will be explained in the next pages.

What’s Next?

This section is divided into smaller parts:

For Loop — repetition with a clear counter
While Loop — repetition based on a condition

Take time to understand the concept of looping before moving on to syntax.

Summary

A loop repeats instructions automatically
Loops reduce repetitive code
They improve efficiency and readability
Loops are a core part of control flow in programming

Understanding loops is essential before learning more advanced topics.