Its a full carfax report from carfax:
http://www.carfax.com/about/car_history/hcabout.cfm
The reports tell you if the car has been in an accident, has a salvaged or reconditioned title , shows maintenance records if that person took it to a dealer. Show recalls and if it passed emissions. I went to buy a 2005 explorer from a guy said it was fine and the report showed it was in an accident. I never buy a used car without pulling one.
Only reason I have it is it was $34 for one report or like $44 for four reports. I only ended up pull three car reports so I have one report left