Howdy All,
What's an adventure path ??? Is it a series of modules strung together or something else ??
D69
Yep it is a campaign that takes you from 1st level (they all start at 1st level) to somewhere between 13th to 17th level (this depends on the indivual adventure path, kingmaker goes to 17th, council of thieves 13th, Carrion Crown 15th etc.)
Adventure paths are a set of 6 softcover books dealing with a single theme / plotline that can potentially take a PC group from 1st to(usually) 17th level.
The adventure path books all take place somewhere on Pathfinder's default setting of the world of Golarion. Each contains articles as well on unique magic items, a few new monsters, a portion of a shortstory, and a bit of world information.
The two best adventure paths I have played don't stop at level 17.
Age of Worms and Savage Tide both go to level 20. Granted they predate Pathfinder, so some conversion is needed :p
You can also find answers to your question in this thread.