Determiners, or noun signals, are special adjectives used before nouns.
There are different kinds of determiners.
The Articles
a, an and the are called the articles.
Demonstrative Determiners
The words this, that, these and those are also special pronouns called determiners. They are used to point out which thing or person you mean. They are called demonstrative determiners.
Quantifying Determiners
Words such as many, much and several tell about quantity without giving an exact number. They are called quantifying determiners.
Interrogative Determiners
The words what, which and whose are used before nouns to ask questions.
Interrogative determiners appear just before nouns.
Possessive Determiners
The words my, your, his, her, its, our and their are used before nouns to show ownership. They are called possessive determiners.