If the battery is stone dead it won't take a jump. If the battery has some life in it check for dirty or loose battery connections. If the battery and connections check okay it could be a bad starter.
Check your battery connections. If they're tight and no corrosion is present, then your battery may be dead. Recharge or jump start the battery. Still clicking? Replace the starter.
check for a draw...(PULLING 12V W/ KEY-OFF)
Check your battery. If it jump-start, its your battery gone. Check your key switch, it might have worn out.
First guess would be a starter motor Does it turn over?
Jump start the car then go to auto parts store they will check the battery for you and let you know what the problem is.Most likely the battery is shot.
you can but it wont stay running if the battery is dead
You need to charge your battery or get a jump. Replace the battery or have it checked because it is dead.
Check ignition relay. Jump the battery directly to the starter and see if the starter is any good.
Jump it, it will either start or it wont
You may have a dead battery. Get a charge in the battery or get a jump start. Also, if you're in the US most of the major auto parts stores (for example, Advanced Auto Parts) will test the battery for free. Check the earth connections between the battery & the chassis also between the chassis and the engine
Get a jump start from somebody else, and then figure out what it was you left turned on or plugged in to drain your battery. If it happens again, replace the battery. By the way, this is why you should belong to AAA or another road-service club.
If you can jump start the car then the battery is not fine. Remove the battery cables and thoroughly clean them. If it still will not start check the voltage at the battery with the engine off. You should get 12.6 volts if the battery is fully charged. 12.4 it is 75%, 12.2 it is 50%, and 12.0 it is 25% charged. I would bet your battery is defective.