Constants are expressions with a fixed value or the value that cannot be changes.
Literals are used to express particular values within the source code of a program. We have previously used these previously to provide concrete values to variables or to express messages we wanted our programs to print out.
F example, when we wrote:
the 5 in this piece of code was a literal constant.
The Literal constants can be divided in Integer Numerals, Floating-Point Numerals, Characters, Strings and Boolean Values.