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SharePoint 2013 apps
A great new feature of SharePoint 2013 is “SharePoint apps” which are available in the “app store”.
“Apps for SharePoint are self-contained pieces of functionality that extend the capabilities of a SharePoint website”
These apps can be hosted in SharePoint environment or can be isolated from SharePoint environment
This application can be hosted in cloud environment.
There are really two sides to apps, the developers view and the end users view. Let’s take a look at each in turn.
Developer view of an app
No matter where an app is hosted, it is essentially a separate entity to the rest of SharePoint. This brings with it some fundamental architectural considerations:
1. Apps can be written using a number of web standards like HTML, JavaScript, ASP.NET, and even PHP
2. An app cannot use any server side SharePoint code
3. In most cases an app can't talk to the parent site or site collection it is accessed from
4. Apps cannot change many elements of the site they are in (e.g. branding, look and feel, changes to the ribbon)
5. Advanced features like timer jobs are not permitted
Apps give developers vastly more freedom when it comes to how they structure and architect their creations. This freedom does mean that much more upfront planning is often required, and a similar increase in testing time is advisable.

App Based SharePoint 2013.
SharePoint 2013 introduce a new cloud app model for you to build secure, scalable, and flexible apps.
You can download the apps from Microsoft store as you do for andriod apps..
Imagine apps that can integrate data and services with SharePoint and your content. Apps that can range from security trading to ordering business cards to requesting vacation time—even ordering lunch. The possibilities are truly endless