The first watches that were created possessed only mechanical processes. Throughout the years as technology evolved so did watches. Modern-day watches are now often made with quartz vibrations and/or electromagnetic pulses that measure time, rather than the mechanisms. Watches are now available in digital or analog, and other innovations have also been made in the watch market. Watches are now capable of more than keeping time. Often modern watches will display the month, year, day, and date as well as the time. Specific watches also possess the additional features of timers, alarms, and/or chronographs; some designs even have global positioning system capabilities. Clocks are used to display, coordinate, and keep the time. Modern clocks are analog or digital, and are available in a variety of designs, and typically measure and indicate the time. Clocks meet the demand of needing a way to specifically measure units of time that are less lengthy than other units of time (like the day, month, or year). Their functions are essentially alike to watches, but watches are able to be worn, and clocks are typically displayed on a surface.