This is the New term I heard now a days in some Designer Portfolio. What is the Role of Front End Developer. Is the role is the same as the Web Designer.?
Yes this is a web designer, as the UI is often called front-end.
These guys are mostly responsible for the HTML/CSS, graphics and layout of the website. Sometimes they are familiar with UI technologies (ASPX/Master Pages. FTL, JSF, Velocity), sometimes not. depending on their exact role in the project
This is an excellent explanation of what a Front-End Developer should be able to do: http://www.onlinetools.org/articles/fed2.html
In a large team, the developer of the front-end could be a separate role from the designer: the latter is responsible mostly for looks (CSS & constraints on the HTML so that the CSS works as intended), the former for the "logical/behavioral" part of the front end (and also needing to negotiate the APIs or REST details with the back-end developers).
A front-end developer handles the public facing side of your website, a back-end developer handles the back end, like pulling information from a database, and maybe even creating the database for small sites. A front-end developer does HTML, CSS, Javascript. The back-end developer does the PHP, C#, XML.