What is "team-build"

Team Build is everything that involves builds made on TFS: build template, agents, the build machine (machine where the agent runs and the build process runs) as a whole.

The 2013 version will be the last with TFS Build as designed, the next version of TFS will bring what is today called vNext, which will be quite different from the existing build, for example, Msbuild will be completely redesigned.