Absolute dating deals with age of rock and relative dating deals with age of fossils.
Explanation:
Absolute age is mainly used to measure the actual age of an object. Relative age is mainly used to determine the age of an object related to other objects.
Absolute age is exact in nature but in the other case relative age is estimated in nature.
To determining age of fossils relative dating is used but in the other hand while determining age of rocks absolute dating is used.
Example in case of absolute age if somebody says she has a younger brother who is 2 years old and elder brother who is 12 years old she is specifically mentioning the age whereas in relative age no age will be specifically mentioned.
