Web design is the overall planning and creation of websites which comprises web graphic design, interface design, information architecture, navigation, layout, imagery. Web designing uses different markup languages, style sheet languages, serve-side scripting, client-side scripting, database technologies and multimedia technologies.

Some principles of web designing include;

Identification of the audience’s level of the equipment available, their needs and interests. Technological aspect as the site requires; mostly graphics, text and graphics and text, graphics and animation.
Consideration of the objective of the site; is it informational, educational, entertainment, personal, organizational and others.
Choosing where to place the site; this is in line with the above mentioned, is it in commercial provider, organizational server, institution server, personal server and others.
Setting up the home page should be very informative to what your page is all about, your goal and purpose.
It is important to plan the content of the site; its text, photos, graphics, audios, videos, applets, etc. The content should always match your home page and all things placed must be relevant to it
Web design should not only be pleasing with our eyes but be sure it is a user friendly one for it to be effective. Once you caught the attention or interest of the users, they must have ease on browsing the rest of your web pages simply giving then an easy navigation structure. In summary, web designing; from its planning, construction and execution is the total responsible for the effectiveness of your site.

This is a very popular niche as most would be marketers do not like to be involved with the technical aspects of Internet Marketing.