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Describes something that is located in an enclosed space or inside a building, or that takes place there.
Wegen des schlechten Wetters wurde das Tennismatch in die Indoor-Halle verlegt.
Because of the bad weather, the tennis match was moved to the indoor hall.
The adjective 'indoor' is almost never declined in German. It either stands on its own after a noun or appears as part of a compound word with a hyphen.
Wir suchen eine Aktivität, die man indoor machen kann.
We're looking for an activity you can do indoors.
'Indoor' is often used in connection with sports and leisure activities. Typical compounds are 'Indoor-Klettern' (indoor climbing), 'Indoor-Minigolf' (indoor mini golf), or 'Indoor-Halle' (indoor hall).
Im Winter gehe ich oft in die Indoor-Kletterhalle.
In winter, I often go to the indoor climbing gym.
'Indoor' is a direct loanword from English and has become established in German usage. It is pronounced as in English.
Das Festival findet dieses Jahr indoor statt.
The festival is taking place indoors this year.
inside
Drinnen and indoor both refer to something inside a building or enclosed area. Drinnen is an adverb and describes where something takes place or is located; indoor is an attributive adjective placed before a noun. Choose drinnen without a noun and indoor directly before a designation.
Wegen des Regens findet heute ein Indoor-Training statt.
Because of the rain, there is an indoor practice session today.
Wegen des Regens findet das Training heute drinnen statt.
Because of the rain, practice is taking place indoors today.
