We seem to have four tags about updating and upgrading:
To update is to "make (something) more modern or up to date." This question should pertain to how to update the Pi's OS's, programming languages, and applications (both native and external.)
Should be used for questions regarding upgrading a major distribution change. Example: Wheezy to Jessie.
a tool to update the firmware of the Raspberry Pi.
upgrade (no tag wiki)
It seems that the difference between some of these (in particular upgrade) is a bit unclear. I'm not entire sure what the difference is, so I can't make any suggestions as to what we need to do.
Do we need to do some tag cleanups or create some synonyms?