Caster Level

A spell's effects (such as range, duration, and damage dealt) typically depend on its caster's level. Which for most spellcasting characters is equal to their class level.

Sometimes a class feature or other special ability provides an adjustment to your casting level. In that case, the adjustment applies not only to the spell's effects, but also to the spell's chances of overcoming your target's spell resistance, and the level used in dispel checks (and the DC of the check).