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Sharepoint 2013 App Overview

What is a SharePoint App?


SharePoint Apps are lightweight self-contained codes, that extend the functionality of SharePoint and resides outside the SharePoint server. The major advantage of  Apps is that since they reside outside the server farm, adding apps to the site does not affect the performance of the SharePoint farm. One of the major issues with solutions in SP2010 was that poorly written custom solutions may bring down the entire farm performance. This can be avoided with Apps.

Advantages of using Apps

  • Apps do not reside on SharePoint server, so it does not affect the farm performance as a poorly developed Sharepoint solution
  • Developers can build apps with HTML, CSS, and Javascript. This would bring in developers in non-Microsoft technologies to the SharePoint Platform
  •  Installation, upgradation, and deletion of apps does not affect the site
  • AppStore provides an easy way of downloading Microsoft validated apps
  • Apps have 2 scopes - Web scope and Tenancy scope. App scope is decided by the administrator who installs the app and not by the developer. When it is installed in the App catalog, it is available for the websites in the Tenancy. It is web scope when installed in websites manually.
More details of app advantages on Sharepoint App Advantages

App Hosting Models





Interesting Reads
Sharepoint 2013 App Overview
Introduction to SharePoint 2013 App Model
A Perspective on SharePoint 2013's App Model
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