i dont get why قائمٌ is an adjective

In Arabic, adjectives usually follow the noun they describe. The word "قائمٌ" (qa'imun) is an adjective that means "standing" or "upright." It is used to describe a noun and provides more information about its state or condition.

For example, in the phrase "طاولة قائمة" (taawilatun qa'imah), the adjective "قائمة" is describing the noun "طاولة" (table), indicating that the table is "standing" or "upright."