Adjectives modify nouns or pronouns. They usually precede the words they modify but they may follow them, separated from those words by a form of the verb be or a subsititute such as seems or feels.
the hot water
the water is hot
the water feels hot
Two important types of adjectives are determiners and participial adjectives.
Adjectives can appear in the positive, comparative, or superlative degree.
small
[positive]
smaller
[comparative]
smallest
[superlative]