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A condition-controlled loop is a type of loop in programming that continuously executes a block of code as long as a certain condition remains true. The loop stops when the condition is no longer true. This allows programmers to repeat a specific set of actions without having to manually write out the code multiple times.

Condition-controlled loops play a crucial role in programming since they help create efficient and compact code. They are used for tasks requiring continuous, repetitive actions like searching for a specific item in an array or list, performing calculations over a range of values, or even managing game logic.

There are two main types of condition-controlled loops: while loops and for loops. 1. While Loop: This type of loop is useful when the number of iterations is unknown, and it checks the condition before executing the code block. If the condition is true, the loop continues; otherwise, it stops. Here's an example in Python: ``` count = 0 while count < 5: print("Hello, world!") count += 1 ``` 2. For Loop: This type of loop is useful when the number of iterations is known, such as when iterating over a specific range or length. The loop contains an initialization, a condition, and an update expression. Here's an example in Python: ``` for count in range(5): print("Hello, world!") ``` Both examples would output "Hello, world!" five times. The difference lies in the structure and controlling mechanism of the loops.