What exactly is Web design
Web design is a process of conceptualization, planning, modeling, and execution of electronic media content delivery via Internet (or World wide Web eg. WWW) in the form of Markup language such as HTML suitable for interpretation by Web browsers (Such as IE and Firefox) thats display as a GUI (Graphical user interface).
Improvements in browser compliance with W3C standards prompted a widespread acceptance and usage of XHTML/XML in conjunction with CSS (Cascading Style Sheets) to position and manipulate web site page elements. See CSS examples here.
The intent of web design is to create a web site a collection of pages that reside on a web server/servers and present content and interactive features to the end user in form of Web pages. Such elements as text, bitmap images (GIFs, JPEGs, PNGs), forms can be placed on the page using HTML/XHTML/XML tags. Displaying more complex media (vector graphics, animations, videos, sounds) requires plug-ins such as Flash, QuickTime, Java run-time environment, etc.
Custom Web Design
Many web design services use standard templates. This makes them much less expensive, and you can browse thousands of web design templates online. The problem is, as always, you get what you pay for. When using a template for your web site, you will be sharing that design with several other companies because anyone can use the same template.