The document discusses the concept of separation of powers, which divides government into executive, legislative, and judicial branches that each act as a check on the others' power. It originated from ancient Greek and Roman ideas of dividing government and was later described by Montesquieu. The founders implemented separation of powers and checks and balances to prevent tyranny and protect minority interests. Critics argue the system does not always function as intended in practice due to imbalances in power between branches and partisan gridlock preventing compromise.