What is a datatype?

• A datatype defines what kind of data a variable can hold in Java.

• Example:

int age = 25;       // age can store integer values
double salary = 5000.50; // salary can store decimal values
char grade = 'A';   // grade stores a single character
boolean isPassed = true; // stores true/false

Java datatypes are mainly two categories:

• Primitive types → int, double, boolean, char, byte, short, long, float

• Reference types → classes, arrays, interfaces, enums, etc.