A data type is an attribute of data which tells the compiler or interpreter how the programmer intends to use the data. It essentially defines the kind of value a variable may hold.

Here's a breakdown:

• Primitive Data Types: These are the most basic data types. Common examples include:
  • Integers (whole numbers)
  • Floating-point numbers (numbers with decimal points)
  • Characters (single letters, symbols, etc.)
  • Booleans (true/false values)
• Composite Data Types: These are created by combining primitive data types or other composite types. Examples include:
  • Arrays (ordered collections of elements of the same data type)
  • Structures (collections of variables of different data types under a single name)
  • Objects (instances of classes, which can contain both data and methods)

Essentially, every variable in a program has a data type associated with it, and that data type dictates how the data is stored and manipulated.