Bitcoin Core is the official bitcoin wallet.
bitcoin core is the
reference implementation of bitcoin protocol. there is no such thing as "official" in a decentralized system because there is no centralized authority to release one.
Yes, but I see people getting confused that the original bitcoin wallet is bitcoin.com or blockchain.com. Because this is what google returns to them. I agree with the decentralisation, but it isn't centralized if the bitcoin developers made the wallet. It wouldn't be closed source neither.