WBTC is an altcoin that they claim to be Bitcoin on another network, and as such, they trade it at the same price as BTC. It's said that he pegged BTC. But they are not real bitcoins, as there is only one bitcoin; any other ones are altcoins, as already explained by Charles-Tim. Don't get deceived; always hold your Bitcoin, as those pegged can be depegged anytime and the value might turn down to zero.
As their price is being backed up by the developers, if the project that pegged it fails today, then the price will definitely be no different from other shitcoins out there. We can use UST as an example of what happens to peg tokens; they're supposed to be equal to $1, but the Luna crash has made it otherwise.