Which of the following data types is used to represent true or false values?

The data type designed specifically to represent true or false values is called a boolean, often abbreviated as bool. This type can hold one of two possible values: true or false. In programming, the ability to evaluate conditions as either true or false is fundamental, especially in control structures like loops and conditionals where decisions are made based on logical evaluations.

Other data types serve different purposes. For example, int is used for whole numbers, double is for floating-point numbers (which can represent decimals), and char is used to represent single characters. None of these types are suited to handle the concept of truth value directly, making bool the clear choice for representing true and false conditions in a program.