Why do I have to keep jump starting my car every morning?

Assuming you haven't added any new, power hungry accessories to your car lately, @jayeff's explanation is an excellent one for checking to ensure that the battery is getting properly charged when the car is running.

However, the other half of that equation is the battery's ability to hold onto that charge, which capability declines with age so as a battery gets older it holds less and less charge until you get to the point where it no longer holds enough to start or run the car.

Here in the US, most auto parts stores will hook up an electrical diagnostic machine to your car for free. That device will give you a rough idea of what might be the problem, but personally I've had better luck actually removing the alternator from the vehicle and taking it in to be tested on their alternator testing machine. That gives much more accurate results and can often point you at the exact cause within the alternator such as failed diodes, worn out brushes or a dead voltage regulator.

If your alternator is putting out the correct voltage then the next thing to do is test the battery. Again, the auto parts stores usually have a battery tester that can tell you if it's any good or not. You'll want the battery to be fully charged when you take it in; it needs to have a charge in order to measure output current against increasing loads. If you don't have a charger, chances are good they can charge it but you may have to drop it off and come back later to test it after they've had a chance to charge it.

Hopefully that'll give you some things to check; take a look at our suggestions and come back and tell us what you found and we'll see what your next steps should be.