Can I send an ETH to an ERC20 address?

Hello, I'm a bit confused about something regarding cryptocurrency transactions. Could you please clarify if it's possible to send Ethereum (ETH) to an ERC20 address? I've been hearing a lot about ERC20 tokens and how they're built on the Ethereum blockchain, but I'm not entirely sure if sending ETH directly to such an address is allowed or advisable. Could you explain the differences between ETH and ERC20 tokens, and whether or not it's safe to send ETH to an ERC20 address? I appreciate your help in clarifying this matter.