State of Nature:Hobbes' concept of the state of nature, which he described as a chaotic and violent condition of human existence prior to the establishment of organized society and government.
Social Contract:Hobbes' idea that individuals in the state of nature agree to give up certain freedoms and rights to a sovereign authority in exchange for the protection and order provided by a government.
Leviathan:Hobbes' influential work that outlines his political philosophy, including the concepts of the state of nature and the social contract, and the justification for an absolute sovereign authority.