If you navigate currently to the Proposals library, you will see a rather uninteresting view—providing exactly none of the information we have available for the Proposals library:
The first thing we will take care of is to modify the default view to include information such as the client, proposal amount, and proposal type. Next, we'll demonstrate how powerful a view can be—with the ability to create grouping, roll ups, sums, and so on.
There is a special out-of-the-box Web Part called the XSLT List View Web Part. As this Web Part implies, it can be configured to display a view of a SharePoint List or Library. In fact, the Shared Documents you see by default on a Team Site home page is an XSLT List View Web Part, configured to show the default view for a document library. These are exactly the same four columns shown by default for our Proposal Library – Type, Name, Modified, and Modified By.
What is XSLT (Extensible Stylesheet Language Transformations...