Noun: A request or plea, often to a higher authority, for a decision to be reversed.
*Example:* "The lawyer filed an appeal against the court's ruling."
Verb: To make a request, especially for help or sympathy.
*Example:* "The charity appealed for donations to help the victims of the earthquake."
There is an adjective form of "appeal," but it is less common and usually refers to something that is attractive or interesting:
*Example:* "The movie's plot had an appealing sense of mystery."