When i turn the car on you hear a clicking sound, but the car won't turn over

The initial diagnosis is a flat battery. (This should give you a continuous chatter). Failing that as a solution the starter is faulty and what you hear is the solenoid on the starter pulling in but the starter is not responding. It could be worn brushes in the starter or bad contacts in the solenoid itself. If it is just a soft click, the relay for the starter solenoid is working but the solenoid is inoperative