I was reading the Player's Handbook I of D&D 4e and couldn't find any mention of grapple.
How does grapple work, if at all? Please give examples.
There is no concept of grappling in 4e.
The concept is replaced with the
Breaking a grab is accomplished by spending a move action to attempt to escape, being pushed pulled or slid out of reach or by teleporting out of the grab. Escape attempts vs monsters are either set by a DC (can be different depending on whether athletics or acrobatics are used to escape), or by the monster's defenses (Fortitude for Athletics, Reflex for Acrobatics). When a PC grabs there is no DC and the character's defenses are used.
To update this to actually answer the question as now posed:
The basic action to grab someone is a standard action in which you make a strength attack against your enemy's Reflex. You are required to have a freehand, and your enemy cannot be more than one size larger than you. If you hit then you are
There are a few more rules related to the grabbed condition, but this is most of the stuff you need for play.