Drug administration

A proper article indicates that its noun is proper, and refers to a unique entity. It may be the name of a person, the name of a place, the name of a planet, etc.

A guide on using proper names

The definite article is sometimes also used with proper names, which are already specified by definition (there is just one of them).

A partitive article types

A partitive article is a type of article, sometimes viewed as a type of indefinite article, used with a mass noun such as water, to indicate a non-specific quantity.

How to avoid negative articles

A negative article specifies none of its noun, and can thus be regarded as neither definite nor indefinite. On the other hand, some consider such a word to be a simple.