"Yours" is a possessive pronoun used to indicate ownership or association. It is often used in personal communication, such as letters or messages, to express that something belongs to the person being addressed. For example, in the phrase "This book is yours," it signifies that the book belongs to the recipient. In addition to its grammatical use, "Yours" can also appear in various contexts, such as in sign-offs of letters or emails. Common phrases include "Yours sincerely" or "Yours truly," which convey a sense of closeness or formality in communication.