Final answer:
The free exercise clause allows citizens to practice the religion of their choice, as protected by the First Amendment. It prevents government interference in religious practices and ensures no one is compelled to support or adhere to a religion against their will.
Step-by-step explanation:
The free exercise clause means that citizens can practice the religion of their choice. This clause is part of the First Amendment to the United States Constitution, which prohibits Congress from making any laws that restrict the free exercise of religion. Essentially, it ensures that the government cannot interfere with an individual's right to follow their religious beliefs and practices. In landmark cases like that of Trinity Lutheran, the application of the free exercise clause has been considered in various legal contexts, confirming the protection against governmental suppression of religious beliefs and practices.
Furthermore, the clause signifies that no one can be compelled to adhere to or support any religious worship or institution against their will, which upholds the freedom of both religion and conscience. It is a core element of American civil liberty, allowing citizens to maintain their religious opinions and to profess them openly without affecting their civil capabilities.