What is visualforce?
Visualforce is markup language that allows to define user interface components in Salesforce. This is very interesting tool which runs o force.com platform. By using page layouts, we can easily configure User interface. But by using visusalforce pages, you can develop your own customized user interface.
Here in Visualforce Tutorial tutorial I am providing information about, how to work with visualforce pages. Hope this will help you to understand basic of visualforce pages.
Above are the few examples to understand about visualorce basics. To learn more about visualforce page see salesforce vf guide