What is a "boolean" used for in programming?

A boolean is a fundamental data type in programming that is specifically designed to hold one of two possible values: true or false. This binary nature makes booleans particularly useful for making decisions in code, such as controlling the flow of logic in conditional statements (like if statements) or loops. By using booleans, programmers can determine the execution path based on logical conditions, allowing for more complex behaviors within applications.

For example, in a conditional statement like if (isUserLoggedIn), where isUserLoggedIn is a boolean variable, the program will execute the block of code inside the if statement if the condition evaluates to true, or skip it if it's false. This capability is essential for creating dynamic and functional programs.