Like with everything else, watches have evolved with time. There are mechanical watches, battery, solar, and kinetic powered watches. Mobile watch, ie. the wristwatch was popularized and materials used for the straps are all metals, including materials like leather. Sapphire crystals are used in watches to improve the quality and durability. Electronic watches with quart movements are mainly used these days. They do not need batteries and get charged with movement of the wrist. A mechanical watch does need winding up but lasts longer. Before the advent of the wristwatch, all mobile watches that could be carried around were pocket watches. They were attached to a chain or rope and were kept in the pocket. Now, people also look at the style and design of the watch. There are specific watches made for different purposes. There are the diving watches and sports watches that are waterproof. Watches talk of us and bring forth our personality. Choosing the right watch based on our need and requirement is important. For a collector of time pieces, he would be looking at the sun and its position in the sky. Then came the sundial and finally the clocks and watches. The actual purpose of the watch as we all know is to