This tag is for questions specific to SDL Tridion 2011 SP1. Version tags should be used **only** when necessary to provide context to the question, and not to simply state that "you are using SDL Tridion 2011 SP1" unless that information is needed.
SDL Tridion 2011 SP1 is the version of Tridion that was released in 2012 as a service pack on SDL Tridion 2011.
Questions specific to this version of Tridion should have the 2011-sp1 tag when necessary to provide context to the question. It also is advised to tag that question with 2011 too, so it is possible to group all the 2011 and 2011 SP1 questions together.