Demonstrative adjectives point out persons, places, or things relative to the speaker's position and distance. They agree in gender and number with the noun they modify and always come before the noun. There are singular and plural forms of the demonstrative adjectives "este/a" (this), "ese/a" (that), and "aquel/la" (that over there) to refer to things at different distances from the speaker. Examples are provided to demonstrate their use with nouns like book, cup, fork.