Constant: A constant is similar to a variable but holds a fixed value that cannot be changed once assigned. It provides stability in programs when there are values that should remain constant throughout execution.
Scope: The scope refers to the part of the program where a variable is accessible and can be used. Variables have different scopes, such as global scope (accessible throughout the program) or local scope (limited to a specific block of code).
Data Type: A data type defines the kind of value that a variable can hold, such as integers, floating-point numbers, characters, or boolean values. It helps determine how the computer interprets and operates on the stored data.