Quartz v. Mechanical. You may have heard the terms "quartz" watch and "mechanical" or "automatic" watch, but don't really know what is the difference, or which is better. A quartz watch is simply an electronic watch, usually powered by a battery, although some are solar, and others are powered by kinetic enery. A good quality quartz watch is extremely accurate and reliable. They are also relatively less expensive than mechanical watches. The only maintenance they require is an occasional battery change. A quartz watch is the best choice for most people who just want an inexpensive, reliable watch to tell the time.
Most Citizen Watches have a technology called "Eco-Drive" which is really just a fancy way of saying solar-powered quartz watch. Solar powered watches don't have a battery that you need to change, but an stopwatches online
internal capacitor that will power the watch for several months when fully charged. Casio, and a number of other manufacturers also offer solar powered watches.
A mechanical watch, is a wind-up watch powered by a spring that turns a series of gears and eventually the hands. It is a more traditional technology that goes back several hundred years. "Automatic" mechanical watches are self-winding. The way this works is that a small rotor on the back of the watch's movement spins around with any movement as you wear your watch. As it spins, it winds a spring, which provides power to the watch. When the spring is fully wound, it will typically power the watch for about 42 hours before it needs to be wound again.