A wristwatch is a timekeeping device worn on the wrist, typically secured with a strap or bracelet. It consists of a case that houses the movement, which can be mechanical or quartz, and a dial that displays the time. Wristwatches can also feature additional functions, such as calendars, alarms, and stopwatches. Wristwatches come in various styles, materials, and sizes, catering to different preferences and occasions. They can be made from metals like stainless steel or precious materials like gold, and some may include features like water resistance. Popular brands include Rolex, Seiko, and Casio.