Demonstrative pronouns in Catalan grammar are essential for indicating the position of people or things relative to the speaker. They include “aquest” (this), “aquests” (these), “aquell” (that), and “aquells” (those) and have four forms: masculine singular, masculine plural, feminine singular, and feminine plural. In Catalan, these pronouns replace the noun they refer to and change according to the gender and number of the noun. Demonstrative pronouns’ use depends on the distance from the speaker and listener, with “aquest” being close to the speaker and “aquell” being far away from both speaker and listener.