Taproot is a Bitcoin upgrade that activated in November 2021. It makes complex transactions, like multisig, cheaper and more private. Taproot addresses start with "bc1p."
Go deeperTaproot (BIPs 340, 341, and 342) added Schnorr signatures and a way to hide the backup spending conditions you never use. A multisig or other complex spend can look like an ordinary single-key payment. It was the biggest upgrade since SegWit.