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In simple words, data type means which type of value a variable has. Basically, there are 8 data types.

1. Boolean
2. Char
3. Byte
4. Short
5. Int
6. Long
7. Float 
8. Double

• The boolean data type is used to store true or false. 
• A byte is a primitive data type and its value ranges from -128 to +127.
• char is a primitive data type and it can hold a single character.
• The short data type is a 16-bit signed two’s complement integer. The minimum value is -32768 and the maximum value is  32767.
• The int data type is a 32-bit signed two’s complement integer. The minimum value is -2^31 and the maximum value is 2^31-1.
• The float data type is a single-precision 32-bit IEEE 754 floating point. The float is used for decimal value.
•  The long data type is a 64-bit two’s complement integer. The minimum value is -2^63 and the maximum value is 2^63-1.
• The double data type is a double-precision 64-bit IEEE 754 floating point. The value is unlimited for double.