What does the C language enumeration mean?

In C language, an enumeration is a data type used to define a set of constants with discrete values. Enumerations can be used to represent a group of related constants, making the code clearer and more readable. Variables of an enumeration type can take one of the constant values defined in the enumeration, instead of any arbitrary value. Enumerations are commonly used to represent limited ranges of values such as states, options, error codes, etc. For example, an enumeration type can be defined to represent the days of the week, including constant values such as Monday, Tuesday, Wednesday, etc. This way, variables using the enumeration type can represent the days of the week, rather than using numbers. Enumerations can be defined using the enum keyword.