According to objectivism, man exists FOR HIS OWN SAKE.
Objectivism is a type of philosophical outlook in life. The concept was developed by Ayn Rand, a writer. She expressed this outlook on life in her books. One of the central teaching of Objectivism is that the most important thing in life is to pursue one's happiness. Other teaching of objectivism include the following: reality exist independently of consciousness, direct contact with reality is made through sense perception, etc.