Questions asked for/related to Google Summer of Code projects.
Google Summer of Code is a global program that offers students stipends to write code for open source projects. Questions tagged with gsoc means that it is directly/indirectly relates to one of the Google Summer of Code project. These questions will not only help current gsoc students but students who are looking forward to participate in upcoming gsocs.
To know more about gsoc you can head over to this link.
You can also find the Google Summer of Code - Civicrm wiki here.
