A crown is a dental restoration that covers and protects a damaged or weakened tooth. It is a custom-made cap that is placed over the tooth to restore its shape, strength, and function. Crowns are commonly made from materials like porcelain, ceramic, or metal alloys, providing durability and a natural appearance. They are used to treat various dental conditions such as severe tooth decay, cracks, fractures, or to improve the appearance of misshapen or discolored teeth. Crowns can enhance the overall aesthetics of the smile, restore proper chewing function, and provide long-lasting dental support when properly maintained through regular oral care practices.