A web designer tends to handle the more creative side of bringing a website to life. These people focus on the look and feel of a website. Color scheming, design fundamentals, and information flow will all be large considerations in their work. Web designers have knowledge of CSS and HTML.
The median salary for a Web Designer in the U.S is $56,532 and caps out at about $75,000, but can vary greatly depending on the employer.
A web developer creates the inner workings and server-talk functionality behind a website. They will build user interfaces using programming languages such as PHP, .NET, Python, C, and Ruby.
The median salary for a Web Developer in the U.S is $62,500. and caps at around $86,000
Occasionally Web Designers may build their own pages, or write small scripts or modules.
A developer that understands a little about design is better able to work with a designer. A designer who understands some additional information about programming and server side application may be better able to design efficently.