A starter is an electric motor needed to turn over the engine to start it.
Simplified diagram of typical starting system
Car starting problems
If when you turn the key to the "Start" position, you hear the starter cranking as usually, but the car doesn't start, then the problem is most likely not with the starting system - check Car no-start troubleshooting guide.
If when you turn the ignition key to the "Start" position and nothing happens, or all you hear is just a click, or the starter cranks very slow then you probably have a problem with one of the component of the starting system. Most often, it's the battery or the starter motor itself.
If you're looking for detailed repair information for your car, there are couple of websites where for a fee you can get an access to an online repair manual for your car or truck. Follow these links:
• Alldata DIY - online automotive diagnostic and repair information
• eAutoRepair - professional service and repair information to automotive enthusiasts.