Tag what is definition of ready

Whenever I start working with a new team, one of the first things we do is defining the Definition of Ready as well as the Definition of Done. Defining and using those two artifacts is not overly complicated but saves all involved from a lot of stress down the road. Nevertheless, I frequently find teams that use neither or don't even know what they are. Thus, I think it makes sense to address what Definition of Done (DOD) and Definition of Ready (DOR) are and why they exist.