SharePoint Server is provided to organizations that seek greater control over SharePoint's behavior or design. This product is installed on the customer's IT infrastructure. It receives less frequent updates, but has access to a wider set of features and customization capabilities. There are three editions of SharePoint Server: Standard, Enterprise, and Foundation (free) which was discontinued in 2016. These servers may be provisioned as normal virtual/cloud servers, or as hosted services
Custom Web Applications
SharePoint's custom development capabilities provide an additional layer of services that allow rapid prototyping of integrated (typically line-of-business) web applications. SharePoint provides developers with integration into corporate directories and data sources through standards such as REST/OData/OAuth. Enterprise application developers use SharePoint's security and information management capabilities across a variety of development platforms and scenarios. SharePoint also contains an enterprise "app store" that has different types of external applications with encapsulated and managed to access to resources such as corporate user data and document data.