Revisions are different versions of a given Arduino board, such as the Uno R2 and Uno R3.
There are several different official Arduino boards. In some cases, the board design has been revised, and a new specification/product has been released. They are distinguished by revision number, such as the Uno R2 and the Uno R3.
This tag can be used for questions about changes between revisions, or the process of revising official board design.
This tag should not be used for questions which relate to one particular revision of a board. Use the relevant revision-specific tag instead, such as arduino-uno-r3.
