SharePoint is a platform for supporting collaboration and content management system. It is a central web-based portal. Using SharePoint, you can manage your colleague’s and your own documents, social activities, data, and information.
When you create a SharePoint solution, Visual Studio adds the default SharePoint project elements to your feature. Before deployment, you can add and remove SharePoint project elements to modify the SharePoint feature. Adding SharePoint project elements to a feature How to add SharePoint project elements with Feature Designer.
Source: add or remove items to SharePoint features and dependencies