What to use this tag for
An Android device can be used to remote-control other hardware, such as e.g. TVs, receivers, cleaning robots, washing machines, computers, cars and more.
It can also be used to remote-control software on other computers, such as e.g. presentations (PowerPoint slides), music players, and more.
There are also ways to achive the opposite, and have your Android device remotely controlled.
In all three cases, this tag applies.
What not to use this tag for
However, there are several things for which this tag seems appropriate, but we already have special tags for to be used instead: