What is SharePoint?

In short, SharePoint is a browser-based collaboration, content management & extensible platform from Microsoft. The latest release of the product is SharePoint 2013.

What are the previous versions of SharePoint 2013?

The previous 2 versions were MOSS 2007 and SharePoint 2010.

What are core components of SharePoint?
Following are the core components of SharePoint:

1. Site Collection & Site
   
2. List & Library
   
3. Web Part
   
4. Workflow
   
5. Apps
   

Additional to these, SharePoint provides Extensible features that allows custom solutions to be integrated.

What are the Features of SharePoint?

Depending on the business perspective the Features of SharePoint are many:

References

http://sharepoint.microsoft.com

Summary

In this article we have explored an Overview of SharePoint 2013.