Arsenal
In short
A place where weapons, ammunition, and military equipment are manufactured, stored, or repaired.
In plain words
It is a building or facility used to keep arms and tools for war. It can be owned by a government or a private group. People use it to prepare equipment for soldiers or security forces.
A simple example
A military base might have a large arsenal to hold all the rifles and bullets used by its troops. A small sub-armory might be kept in a patrol vehicle for quick access during a shift.
Why it matters
Arsenals are vital for national defence and security. They ensure that military forces have the necessary tools ready for use at any time.
Easy to mix up
Do not confuse it with the London football club of the same name.