On-Airport Parking - This refers to parking within the airport boundary. Airports, however, are generally big places so always check the transfer times and distance to the terminal. In general the closer you are to the terminal the more you pay for the convenience.
Off-Airport Parking - These car parks are located outside the airport boundary. Often the transfer times can be shorter than the on-airport car parks and often they are cheaper, so its worth checking the details
Valet or Meet and Greet Parking - This is the most convenient form of airport parking. A driver will meet you to collect your car at the terminal before you check in, take it to the car park and then will return your car when you return. This reduces the time taken to transfer to/from the terminal.
Airport Parking and Hotel - Start your holiday a day early with airport hotels and parking. Park the day before and leave direct from your airport hotel with no worries about traffic or missing your flight. There are some very good deals available.