Overlanding - Commonly known to be a type of camping involving travel to remote destinations where the journey is the principle goal.
Camping - Travel to a remote destination where the goal is to arrive at the destination. Often staying in the same location for multiple nights. 4wd not required for established campgrounds.
Rock Crawling - Extreme 4wd, highly modified vehicles. Designed to tackle difficult trails. Mostly not street legal and towed to off road parks and extreme 4wd trails.