it normal for a crypto site to use a new wallet address for every order?

Hi everyone, I’m still pretty new to crypto and trying to understand how things work . I been buying from a site that I trust where I already made a few purchases and everything has gone smoothly so far .But I noticed something kinda interesting. Every time I make a new order, the ETH I send goes to a completely different wallet address. I checked the transactions on Etherscan, and sure enough, it’s a new receiving address each time. Is this normal? Does that mean the site owns tons of wallets? Or is there some system that automatically generates a new wallet address for each transaction? What is the reason of this mechanism? I’m not suspicious or anything, just genuinely curious how this stuff works behind the scenes.