Microsoft has incorporated a new application development model in SharePoint 2013 called the SharePoint app.
Certainly, we’ve all become familiar with the phrase, “There’s an app
for that.” Well, now SharePoint can say the same. These self-contained
web applications can come out of the box or be downloaded from
Microsoft’s Office Store. Apps provide users with a way to take
advantage of existing applications that others have already built rather
than building them from scratch. Lists and libraries are apps as well
as other useful mini programs.
Perhaps you want to highlight a “Tip of the Day” section on your
SharePoint site or implement a Timesheet in which employees can enter
their project hours. You can download these apps from the Office Store
for free instead of hiring a developer to design and implement it!
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In the upper-right corner of the window, click the Settings button (the small gear icon next to the name of the logged-on user).
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On the menu that appears, click Add An App.
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On the Your Apps page, click the app that you want to add to your site.
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In the Adding Tasks dialog box, enter a name for the new app.
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Click Create.