In addition to showing the time, any standard watch will show the date, month and year. Watches can be broadly classified as quartz watches and mechanical watches. Mechanical watches do not require battery and need manual winding or even automatic winding watches are there. On the other hand, quartz watches need battery and they use quartz crystals. Electronic watches maintain more accuracy than mechanical watches. The display of watches can be in the analog or digital form. Now the watch industry has myriad types of watches which are classified based on their functions. Chronograph watches, perpetual calendar, diamond watches, moon phase, dive watches etc are some of the popular watches. It is also possible to look for the brand name before making a purchase.