What does it mean to decrement a number?

Decrementing a number refers to the process of reducing its value by one. This is commonly employed in programming and mathematical contexts, where operations often require adjusting values. For instance, if a variable holds the value of 5, decrementing it would change the value to 4. This action is essential in various algorithms and loops, where the amount of something (like a counter or index) must be decreased systematically.

The other options do not accurately represent the concept of decrementing: increasing a number (choice A) would raise its value rather than lower it; doubling a number (choice C) means multiplying it by two, which is an increase; and squaring a number (choice D) refers to raising it to the power of two, which also increases its value. Understanding these terms, particularly how they relate to decrementing, is vital for grasping fundamental programming concepts.