Can you buy SOL on ETH?

Excuse me, I'm a bit confused about something regarding cryptocurrency transactions. I've been hearing a lot about SOL and ETH, and I'm wondering if it's possible to purchase SOL using ETH as a means of payment. I understand that they are both digital assets, but I'm not sure if they are directly interchangeable or if there's a specific process that needs to be followed. Could you please clarify this for me? Thank you in advance for your help.