This tag is used for SharePoint apps (also known as SharePoint Add-ins) development.
SharePoint offers a new flexible development model - you can use SharePoint to create apps for SharePoint that take advantage of standard web technologies, such as JavaScript, OAuth, and OData. And SharePoint 2013 provides you with functionality to interact with SharePoint resources and a wide range of hosting options.
There are two basic kinds of apps for SharePoint — SharePoint-hosted and Provider-hosted. The new app for SharePoint development model gives you the ability to build apps that take advantage of SharePoint capabilities and that run in the cloud instead of on your SharePoint farm. This flexible development model, along with the integration of standard web technologies, makes SharePoint development work more like other kinds of web development that you may already be doing.
Useful Links:
