The Full Form of WSP is Windows Sharepoint.

SharePoint is a web-based collaborative platform that integrates with Microsoft Office. Launched in 2001,SharePoint is primarily sold as a document management and storage system, but the product is highly configurable and usage varies substantially among organizations.

Microsoft states that SharePoint has 190 million users across 200,000 customer organizations

Windows SharePoint Services (WSS) is a portal-based platform or Web application framework developed by Microsoft and launched in 2001 in order to integrate content and document management with networking and intranet. WSS is composed of multiple Web technologies that are backed by a common infrastructure, allowing organizations to create “sites or portals” that foster process efficiency and collaboration.