Channeling refers to an action that requires the constant attention of the person performing them. While channeling, no other actions or movements can take place during this time. If any other action is attempted, the channeling ceases without completing. Additionally, any damage caused will interrupt the process though in the case of spells, it is possible, through talents, to minimize or remove the effect of damage on channeled spells.
There are many channeled spells and abilities in the game. A few examples include: