In computer science, this is a programming structure that repeats a sequence of instructions until a specific condition is met.

The programming structure you are referring to is called a loop. Loops are fundamental in computer science and programming, allowing for the repeated execution of a block of code as long as a specified condition holds true. There are several types of loops, including:

1. For Loop: Used to execute a block of code a specific number of times. It typically involves an initialization, a condition, and an increment/decrement mechanism.

2. While Loop: This loop continues to execute as long as a given condition is true. It checks the condition before each iteration.

3. Do-While Loop: Similar to the while loop, but it checks the condition after executing the block of code at least once.

Loops are essential for tasks such as iterating over arrays, generating repetitive outputs, or managing more complex algorithms where repeated actions are required until a condition, like user input or a computed state, is met. Understanding how to effectively implement and manage loops is crucial for writing efficient and effective programs.