Anything to do with stationary training tools where the bike's rear wheel has to be removed, and the chain is interfaced with a cassette in the trainer.
This tag excludes rollers
Popular brands of Turbo include:
Turbos may be smart, or dumb machines that simply resist your tyre with a variable resistance.
Smart trainers have electronics that interface with a phone, computer or straight to an internet-connected service, so that you can "ride" a virtual course and the trainer reacts to gradients and winds and even draughting other virtual riders.