what is the different between Normal ASPX pages and Master Page?.what is the need of MasterPage?Where and in what situation we have to use Masterpage?

Master page is like a temple t.We can design whole structure for our website from our master page like navigation menus,include banners.We can modify whenever we need and make changes very easily. We can display other pages information from our master page and provide consistent look for each and every page. In normal page we cannot provide contents for other pages and consistent look. Master page is used to design your website home page and give the platform to navigate the whole website.When there is a need to use same and consistent look is necessary at that time we can use master page and from there we can navigate to other pages.