How to Convert ERC-20 tokens back to Ether[eum]

From my understanding, Ether is converted to an ERC-20 token (like BAT), via a smart contract. Ether is assigned to that contract by sending Ether to the smart contract’s address. Please correct me if I’m wrong in any of that.

My question though is, how does one convert an ERC-20 token (like BAT) back to Ether? If the smart contract holds the relationship between Ether that I sent to it, how do I convert the ERC-20 token back to Ether if I no longer want it? Instead, I’d just like Ether to use for other purposes.

Thank you for helping me understand this.

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