Determiners and adjectives are related in such a way that they both modify a noun or a noun phrase. However, the main difference between the two is that determiners are placed before nouns and introduce them to the audience, while adjectives modify nouns by providing further details about them. Another difference between the two is that determiners cannot be graded unlike adjectives, which can be expressed in different intensities. For instance, an object may be big, bigger, or biggest. However, it cannot be “that-est” or “the-est.” Furthermore, adjectives are only optional parts of a sentence, while determiners are necessary and indispensable.