Glitches

Glitches are either errors or bugs in any program(game, software, etc) that can cause undisired or interesting results. In relation to Halo, glitches can be exploited in many ways to make the game interesting or annoying.

Halo 2 Examples

In Halo 2, many glitches resulted from unforseen actions the developers did not think could occur. Players could do things such as Superjumping or Superbouncing, Get past Invisible Walls to get out of maps, etc.