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Swinging is a lifestyle for people who enjoy sex for fun, rather than as the glue in a relationship.
It is mainly a lifestyle for couples, but as many couples enjoy having a 3rd person join them for a 3some there are many singles in the lifestyle as well.
The advantages of swinging over going to a club and picking up a stranger is that swingers are looking for NSA fun. They will not keep hassling you for another meet, unless you want to meet them again.
Basically swingers are people who:
The main criteria for being a swinger is that you are open and honest with yourself, your regular partner and the people you meet.