Depot (/ˈdɛpoʊ/DEP-oh or /ˈdiːpoʊ/DEE-poh) is from the French dépôt which means a deposit (as in geology or banking) or a storehouse. In English, depot can mean any one of a number of things, with minor variances between the different English-speaking countries:
Motive power depot, where trains and trams are sheltered and eventually maintained when not in use
Propellant depot, which supplies fuel to spacecraft
Castaway depot, contains stores and survival gear for victims of shipwrecks
A train depot, where mainly locomotives are sheltered and repaired
Used as a part of railway station's name, because the same place was previously or still is being used as a train shelter and naturally became a railway station as well (e.g. Boise Union Pacific Depot)
Bus garage or 'bus depot', where buses are sheltered when not in use
Used as a part of bus station's name (e.g. Ang Mo Kio Bus Depot)
Technology
An application in the Radio Service Software
The format for Hewlett-Packard's Software Distributor
Military
Regimental depot, the headquarters and training grounds of a regiment
Main Operating Base, an overseas base for the US military
Logistics center
Pharma
Depot injection, long-term drug delivery by an injection formation (typically 2 weeks - 6 months)
Other
Depot, Poland, a village
RCMP Academy, Depot Division, in Saskatchewan, Canada