In SharePoint 2007, the file system location where all the SharePoint deployment files resided was called the “SharePoint Hive”.
The name changed in SharePoint 2010. It is now called the “SharePoint Root” and it is located on the server file system, in the following path:
<drive>:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14
Developing for the SharePoint platform means that more often than not, you will need to recall this path.