Question

What do you mean by module ?

Answer 1

1.

each of a set of standardized parts or independent units that can be used to construct a more complex structure, such as an item of furniture or a building.

"ships are now built in modules rather than built in a whole from the base up"

2.

a detachable self-contained unit of a spacecraft.

"Spacelab, an extra module for the shuttle, will quadruple the experimental facilities on board"