Is printer paper a4 or letter?

Is printer paper a4 or letter? What exactly is A4 paper, and why does it have a different name than the "standard" paper size?

Rite in the Rain All Weather Printer Paper, 8.5x11 Letter, No. 8511-50

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Operitacx 50pcs Sheets Printer Paper A4 Letter Paper A4 Printer Paper Brown Kraft Paper Parchment Paper Printing Paper Stationary Paper Light Color Paper Single Sided B5 Stationery Paper : Arts

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PRINTING TO MATCH THE PAPER SIZE

What size is A4 Paper?, Guide to Paper Sizes

Legal vs. Letter Size and Other Paper Dimensions

What's A4 Size Paper & When to Use It

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How to print an A4 printable onto US letter size paper (and vise versa)

Is printer paper a4 or letter?