A pronoun that doesn't make it clear to whom or what it is referring to is said to be indefinite. Someone ate the last slice of pizza, for instance, uses the term someone as an indefinite pronoun. Although we are aware that the pronoun someone refers to a person, we are unaware of any further details about them.
No specific person, thing, or amount is mentioned while using an indefinite pronoun. It is ambiguous and "not certain." All, another, any, anyone/anyone, anything, each, everyone/everything, few, many, nobody, none, one, several, some, and somebody/someone are examples of common indefinite pronouns.
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