有的 (yǒu de) is a pronoun meaning 'some (of a group)' — it singles out a subset of a mentioned group, often in the pattern 有的…有的… (some…some…). It's close to 有些 (yǒu xiē), but 有些 can also be an adverb meaning 'somewhat'; 一些 (yī xiē) is a quantifier, not a pronoun. 有的 always refers back to a specific group.