1) String - stores text, such as "Hello Techlearn". String values are surrounded by Double Quotes.
2) int - stores integers (whole numbers), without decimals, such as 12345 or -12345
3) float - stores floating point numbers, with decimals, such as 18.55 or -18.55
4) char - stores single characters, such as 'a' or 'B'. Char values are surrounded by Single Quotes
5) boolean - stores values with two states: true or false

Note:
String is Class

int, float, char, boolean are keywords.