Meaning

• Someone who contains; something that contains.

• An item in which objects, materials or data can be stored or transported.

• A very large, typically metal, box used for transporting goods.

• (by extension) Someone who holds people in their seats or in a (reasonably) calm state.

• A file format that can hold various types of data.

• An abstract data type whose instances are collections of other objects.

• Any user interface component that can hold further (child) components.