Understanding what an indefinite pronoun is easy-peasy.
An indefinite pronoun is a pronoun that does not refer to any person, or thing in particular.
Examples of indefinite pronouns include: anything, something, anyone, everyone.
This is how an indefinite pronoun can be used.
There was something in the way
In this sentence the indefinite pronoun is something. It is referring to an unknown entity.
If you need to recap on what exactly is a pronoun, here's a quick reminder.
A pronoun is simply a word used instead of a noun. Here are some examples of pronouns ; I, me, you, he, she, it, that, they, each, who, somebody.
There are three types of pronouns. These are subject pronouns, object pronouns and possessive pronouns.
For more info on pronouns click here