Can you swap on MetaMask?

Excuse me, I was wondering if I could get some clarification on something. The paragraph mentions the possibility of swapping on MetaMask, but I'm a bit unsure of what exactly that means. Could you please explain what it entails and how it works? Are there any limitations or fees associated with swapping on MetaMask? I'm trying to get a better understanding of the process before I make any decisions. Thank you for your help.