Can you buy SOL on Ethereum?

Can you please clarify for me, is it possible to purchase SOL tokens directly on the Ethereum blockchain? I'm interested in adding SOL to my crypto portfolio, but I'm not sure if I need to use a different platform or if it's simply a matter of connecting the right wallet and using the appropriate exchange. Could you elaborate on the process or any potential obstacles I might encounter? I'd appreciate any insights you can provide on this matter.