The prefix "im-" is commonly used in the English language to indicate negation or the opposite of a word. It is derived from the Latin prefix "in-" but is specifically used before words that begin with "m" or "p." For example, the word impossible means not possible, while imperfect refers to something that is not perfect. In addition to negation, "im-" can also imply a sense of inclusion or movement toward something. For instance, the word immerse means to plunge into a liquid or to involve deeply in an activity. This dual function makes "im-" a versatile prefix in forming various words.