You is the word used to talk to the person or people you are speaking to. It can mean one person or more than one person.
“You” comes from Old English “ēow” (plural) and “þē” (singular), but over time the forms changed and merged. Modern English ended up using “you” for both singular and plural, unlike many other languages.
English once had separate words for one “you” and many “you,” but they collapsed into a single form. That’s why some dialects invented new plurals like “you all” or “y’all” to fill the gap.
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