Advantage of using a framework

[Sony Agrawal]

I am new to web development.
I heard that by using some frameworks like struts we can build an application FASTER and Scalable.
I am not sure how does using a framework help in building an app faster.... Its may be because i have not used struts yet.
Can some one tell how is it? and why it is not possible by just using servlets and JSP?
Hope i am clear.

[Joe Ess]

Sony Agrawal wrote:I am new to web development.

There's your problem. If you write more than one web app, you'll quickly discover that you reuse (if you are smart) or rewrite (if, well, you aren't) the same code over and over. Frameworks aim to package that reusable code into a small, well-tested bundle to save you time and energy.
Frameworks are not essential. I've still found the occasional use for Plain Old Java Servlets. However, if one is writing a non-trivial application, a framework can save a lot of work.