Grapple
You hold the target in place. You must have at least one hand free to perform a grapple combat maneuver. Your target has the grappled condition, meaning she can’t move from her current space and takes further penalties until she either uses a standard action to attempt a grapple combat maneuver to grapple you (giving you the grappled condition) or uses the escape task of the Acrobatics skill to break free. If the result of your attack roll equals or exceeds the target’s KAC + 13, the target is instead pinned for the same duration, and she can’t take any actions that involve moving her limbs other than to attempt to escape.
The grappled or pinned condition lasts until the end of your next turn, unless you renew it on your next turn with another grapple combat maneuver. The condition ends immediately if you move away. As long as you have one target grappled or pinned, you cannot attempt to grapple another. The grappled and pinned conditions are further detailed in Conditions on pages 276–277.
When you renew a grapple, you can remove one item from the target’s body that can be easily accessed, including most weapons and equipment (but not worn armor). Doing so immediately ends the grapple.
Source
Core Rulebook pg. 246