What is an adjective?

[Dolmaacha]

What is an adjective and how do I use them in English? Please help me.

[Milanya]

Adjective is a word that describes a noun or pronoun. In the phrase 'black hat', 'black' is an adjective and in the sentence `It makes her happy', 'happy' is an adjective.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Dolmaacha]

Thank you Milanya. That was helpful. Acha is having a difficulty with her English grammar.
Is there an adjective in above line? And do I need to put a before difficulty?

[Milanya]

[Dolmaacha]

Thank you very much.