"Thy" is an archaic form of the word "your," used primarily in English literature and historical texts. It is a second-person singular possessive pronoun, indicating ownership or association. For example, in the phrase "Thy will be done," it refers to something that belongs to the person being addressed. This term is often associated with Shakespeare and other writers from the Early Modern English period. It is commonly found in religious texts, such as the King James Bible, where it adds a formal or poetic tone. Today, "thy" is rarely used in everyday language but may appear in artistic or literary contexts.