Wikipedia:Container category
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Acontainer categoryis acategorythat contains onlysubcategoriesrather than articles. These subcategories will normally themselves contain articles.
For example,Category:Drummers by nationalityis a container category, and contains only subcategories, such asCategory:British drummers.Articles on individual drummers are in the subcategories of this container category, for example British drummers are in the subcategoryBritish drummers,or in subcategories further down the tree.
Containerizationis a process of turning a regular category into a container category by splitting it using additional criteria. For example, nationality can be used as a criterion, as in the drummers example above.