What is the name of the type of agreement individuals enter into to form their society?

The agreement among the members of a society to cooperate for social benefits and to form the society in which they live or it essentially binds people into a community that exists for mutual preservation is called Social Contract. People gain the civil freedom of being able to think and act rationally and morally but they sacrifice the physical freedom of being able to do whatever they please, when they enter into civil society. It is the vision that persons' political and moral obligations are dependent upon a contract. Jean-Jacques Rousseau believes that only by engaging into this contract that people become wholly human.

The executive branch is more responsible for interpreting laws !