Which language is required to set up a web application?

Firstly, u will need to understand HTML code, that the basic to make any web application. Other than that, u can add the dynamicity of the web using javascript and for database usage u have to build php application so that it can communicate between client and server. Those are the basics. I duno if u r a newbie in web developing, but if u r then u can use dreamweaver to start. It supports all the features i mentioned above. Have a nice try. :-)