Membership lounges or day pass. Amenities will vary but usually free alcohol, food and nice place to sit and relax. Clean bathrooms. Some are airline specific like the Delta Skyclub or AA Admirals club. Some are connected o credit cards like the AMEX Centurion Club, Chase Saphirre Club or the Capital One Clubs. Some are private like "the Club".
I primarily use Delta Skyclubs and Amex Lounge. If you have a platinum AMEX, it gives you access. (Have to be on Delta flight for Delta Skyclub though but Amex gets you in)
https://www.delta.com/us/en/delta-sky-club/overview
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