die Tiefgarage
underground garage
A garage located underground or in the basement level of a building and used for parking vehicles.
Ich habe mein Auto in der Tiefgarage des Hotels geparkt.
I parked my car in the hotel's underground garage.

underground garage
Loading your saved state.
underground garage
A garage located underground or in the basement level of a building and used for parking vehicles.
Ich habe mein Auto in der Tiefgarage des Hotels geparkt.
I parked my car in the hotel's underground garage.

The word is a compound of the adjective 'tief' (deep) and the noun 'die Garage' (garage). So it literally describes a garage that lies deep down, usually underground.
Viele moderne Wohnhäuser haben eine Tiefgarage.
Many modern apartment buildings have an underground garage.
Pay attention to the case with the preposition 'in': movement into the garage takes the accusative, while location or parking in the garage takes the dative.
Fahren Sie bitte langsam in die Tiefgarage.
Please drive slowly into the underground garage.
Common verbs used in connection with an underground garage are 'einfahren' (to drive in), 'ausfahren' (to drive out), 'parken' (to park), and 'abstellen' (to leave/park). Typical nouns are 'die Einfahrt' (entrance), 'die Ausfahrt' (exit), and 'der Stellplatz' (parking space).
Die Ausfahrt der Tiefgarage führt direkt auf die Hauptstraße.
The exit of the underground garage leads directly onto the main road.
parking space / parking lot
'der Parkplatz' and 'die Tiefgarage' both have to do with parking vehicles, but they do not mean the same thing. A 'Parkplatz' is an area or individual space where a car can be parked. A 'Tiefgarage' is an entire parking area underground or in the basement level of a building. There are many parking spaces in a 'Tiefgarage'. Learners may confuse the words because you park in both places. If you mean the individual available space, say 'Parkplatz'. If you mean the underground building or underground area, say 'Tiefgarage'.

Unter dem Einkaufszentrum gibt es eine große Tiefgarage.
There is a large underground garage beneath the shopping center.
Am Kino suchen wir lange nach einem Parkplatz.
At the movie theater, we spend a long time looking for a parking space.