Web Design and Web Development sounds very similar but these two different things in function as well as in concept. But both depend upon each other, without web design there is no value of web development and vice versa.

Web Development:

It is used to make back end by some knowledge of programming language like php, c, c++ etc. and programming tool. Web development is a  art programming which provides many functionality like login, download song, making online payment, doing online shopping, making own social networking page etc. to user .Quality web development shows web designers’ work to the web world.

Web Design:  

It is an art of making attractive website with perfect accessibility. Basically web designer use html, css with lots of other designing tools to make a good looking and attractive web site. Before starting a web design for web site web designer keep some basic steps regarding website design. An attractive website should have good design, great accessibility and most be goal oriented.

Now most of the web designer has development knowledge, so most it firms hire multitalented web people for more profit.