I want to know about web designing,its purpose, how to do that and where its done.

Hi, Web designing is basically the creation, development, and maintenance of web sites. The purpose is to ensure that the web sites always look attractive, are constantly updated, are popular with search engines, and are free from technical errors.
Many activities are involved in web designing primarily graphic designing, search engine optimization (SEO), software encoding, multimedia creation, and HTML processing.
With the tremendous growth of the Internet in India, web designers doing the above tasks are highly in demand. Many universities offer various short and long-term web designing courses.
You can do a full-time three-year degree course such as a B.Sc. in multimedia and web design. Or you can do the several certificate or diploma courses (usually 1 year) offered by several recognized institutes like Aptech, Arena Animation Academies, and Maya Academy of Advanced Cinematics.