URL means uniform resource locator every resource have its own unique address in the URL format.
Here HTTP is the protocol tells the server which communication protocol will be used.
www.bhabani.com- it is the server name. this name maps to a unique IP address. You can also specify an ip address instead of server name.
8080- this is the communication port. This part of URL is optional. A single server application is identified by a port. If you do not specify the port number then port 80 is the default.
Index.html – it is known as resource.i.e. the name of the content being requested. This could be an html page, a servlet, an image,pdf,music, video etc.