"Coinjoin" is a technical term for a transaction that contains inputs from multiple users. Dual funded Lightning channels are technically a coinjoin.

"Mixer" generally refers to websites that take custody of your funds. They're basically phishing scams for people who want privacy.

if there is a coordinator, it's not a coinjoin, it's a mixer

kilianbuhn

The default coinjoin coordinator ran by zkSNACKs (the company that sponsored Wasabi's development) shut down in June. Community members run their own coordinators now.