SharePoint is a collection of products and technologies that supports collaboration, enterprise content management, search, business intelligence and more.
The current released version (at the time of editing this article) is SharePoint 2010, which comes in three varieties: -
Previous versions include Microsoft Office SharePoint Server 2007 (MOSS) and Microsoft Windows SharePoint Services 3.0 (WSS 3.0). The following versions are available for public download (64-bit only):
Enterprise and Standard Editions contain identical files, but they differ in licensing terms.