e938ed2d_SharePoint_Server__2007__2010___SharePoint_Farm_Solution
[0] Hosting [Sandboxed Solution] Sandbox solutions are also hosted within the SharePoint Farm but they are executed in sandbox worker process (SPUCWorkerProcess.exe). [Apps for SharePoint] Apps run completely outside of the SharePoint server, and their custom code executes either within the context of the client browser or on other servers that are not running SharePoint such as Web servers in the cloud. [SharePoint Farm Solution] 
SharePoint Farm solutions are hosted within the SharePoint Farm and they are executed within the main SharePoint worker process (w3wp.exe).
A Point For Sharing On SharePoint Server (2007, 2010)
SharePoint Farm Solution