Servlet Config as the name suggests, provides Servlet specific configuration information to a particular servlet. For Example :- the information that u specify in the web.xml file like this
<servlet>
<init-param>...
</init-param>
</servlet>
Each servlet will have its own servlet config object, which will be specific to that servlet.
ServletContext
--------------
It provides application view to all the servlets. There is one ServletContext per JVM for one application.
It also provides methods to access application wide parameters specified
in <context-param>....</context-param> tag in web.xml.
These will be accessible to all the servlets.
I hope it works for you...