What is the difference between indefinite pronoun and adjective pronoun?

The indefinite pronouns are used in place of nouns for people, things, or amounts that are unknown or unnamed.

They are: all, another, any, anybody, anyone, anything, both, each, either, enough, everybody, everyone, everything, few, fewer, less, little, many, more, most, much, neither, nobody, no one, nothing, none, one, other, others, several, some, somebody, someone, something, such, and they (people in general).

The adjective pronouns are called possessive adjectives, which are placed just before to describe that noun as belonging to someone or something,.

They are: my, your, his, her, their, its.

Examples:

Everyone has left the meeting but some are still waiting for a ride. (indefinite pronouns)

My father repaired my bicycle. (possessive adjectives)

Note: When an indefinite pronoun is placed before a noun, it is functioning as an adjective.

Example: Some people are still waiting for a ride.