Where can I get free Sepolia ETH?

Excuse me, could you please elaborate on where exactly one could acquire free Sepolia ETH? I understand that Sepolia is a test network for Ethereum, but I'm curious about the legitimacy and safety of any sources offering free tokens. Are there any reputable faucets or other methods that you would recommend for obtaining these test tokens without any cost or risk? Additionally, what's the purpose of using Sepolia ETH, and how does it differ from the main Ethereum network? Thank you for your insights.