Pathfinder Advanced Player’s Guide (2nd Ed) - Rules of Play says:
Ready to go beyond the basics? Expand the limits of what's possible with the Pathfinder Advanced Player's Guide! This 272-page Pathfinder Second Edition rulebook contains exciting new rules options for player characters, adding even more depth of choice to your Pathfinder game! Inside you will find brand new ancestries, heritages, and four new classes: the shrewd investigator, the mysterious oracle, the daring swashbuckler, and the hex-slinging witch! The must-have Advanced Player's Guide also includes exciting new options for all your favourite Core Rulebook classes and tons of new backgrounds, general feats, spells, items, and 40 flexible archetypes to customize your play experience even further!