Establishment Clause: This clause in the First Amendment prohibits the government from establishing an official religion.
Free Exercise Clause: This clause in the First Amendment guarantees individuals' right to practice their chosen religion freely, without interference from the government.
Lemon Test: A legal test used by courts to determine if a law violates the Establishment Clause. It involves three criteria: secular purpose, neither advancing nor inhibiting religion, and no excessive entanglement with religion.