Cosmological arguments: A family of arguments for the existence of God that postulate God's existence as the ultimate cause or ground or explanation for the cosmos (the universe). Cosmological arguments normally make use of some principle of explanation, causality, or sufficient reason. Thomas Aquinas and Samuel Clarke are among the more famous proponents of this type of argument. (Source: C. Stephen Evans, Pocket Dictionary of Apologetics: Apologetics & Philosophy of Religion. Downers Grove: InterVarsity Press, 2002. s.v. "cosmological arguments".)
I will be addressing one argument called the 'kalam cosmological argument in a post in the very near future.