Well, there is, “Hey you!”

Try to imagine any communication without pronouns.

Thank Flo, Flo, for asking Flo’s question. @Love_my_Doggie hopes Flo will be happy with the answers Flo receive.

Thank you, Flo, for asking your question. I hope you will be happy with the answers you receive.

We do the best we can to convey the identity required.

No. Second-person pronouns (you, you all, y’all, thee, thou, your, thine) are used to address people who are there, whether or not one remembers their names.

Third-person pronouns are for referring to other people, and can be done even when they are nearby, although some people consider that rude in some circumstances.

“It” is also a pronoun. It refers to things, not people. And of course “they” and “them” can be either things or people.

A pronoun simply takes the place of a noun in a sentence. It refers to a noun because there has to be a noun somewhere that it’s taking the place of. For example, “Take this bowl and put it on the table.” Here, “it” refers to “bowl.” “Bowl” is a noun. We don’t want to name the thing every time we speak of it (it), so we replace it with a pronoun, but it (different it—this one’s an expletive “it”) only makes sense if we know what it (the pronoun) refers to.

What is referred to is called the “antecedent”—meaning the thing that goes before.

Edited:
OMG I didn’t include the key part of the OP, which is *3rd person/s I should flag the question.
If you would too, please.

“When we’re using the 3rd person pronoun about a person, we’re not calling the person, we’re referring to he/she/them, correct or not?” My answer is of course.

…My answer is “Of course.”