A clicking sound when you try to start the car is a dead battery. It may be that the alternator is not charging it properly.
A clicking sound, when trying to start the engine, indicates a dead battery or poor (dirty) battery or starter relay connections.The clicking sound is the starter relay(soleniod) not getting enough power to hold it's contact points together.
your battery is gone flat by the sound of it
If your car makes a clicking sound when you try to start it, try to jump the battery. If that starts it, check the electrical system and if it was the battery, replace the battery. If jumping it does not fix it, have a mechanic look at it.
Clean the battery cables.
A weak battery. There is not enough voltage to hold the starter solonoid in.
Clicking usually is a sign of a bad battery or starter
dead battery, jump start and maybe buy new battery, you could allso have a bad alternater
Check battery, charge it or change it. Dead battery.
the battery is dead. charge it. if the battery won't charge buy a new one.
Jump start car and ensure alternator and battery are good.
Use battery load tester and properly test battery. When battery fails, replace it.