What do you call a block of code that only runs when it is called?

A block of code that only runs when it is called is known as a method. In programming, a method is a reusable piece of code that performs a specific task. It is defined once and can be executed multiple times by calling its name, often with the option to pass parameters for more dynamic behavior. This allows for better organization of code, reducing redundancy and improving maintainability.

In contrast, a variable is a storage location that holds data, a loop is a control structure used to repeat a set of instructions until a condition is met, and a condition typically refers to a statement that evaluates to true or false and is used to control the flow of a program. Understanding the unique role of methods is fundamental in programming, as they encapsulate functionality and promote a structured approach to coding.