What is not but?

"Not" is a negative adverb that is used to indicate the absence or negation of something. It is used to negate a verb, adjective, or noun that comes after it. For example, "I do not want to go outside" means the speaker does not want to go outside. "Not" can also be used to create negative contractions, such as "can't" (cannot) or "won't" (will not). Additionally, "not" can be used to give a response that denies a statement or question made by someone else, such as "Not really" or "Not really sure." In summary, "not" is a versatile word that carries a negative connotation and is used in different contexts in the English language.