Swinging and non-monogamy are both forms of consensual non-monogamy, meaning that they involve having romantic and/or sexual relationships with multiple people with the knowledge and consent of everyone involved. However, there are some key differences between the two.
One key difference is the focus of the relationships. In swinging, the primary focus is on recreational sexual activity with other people, while in non-monogamy, the focus can be on building emotional and romantic connections with multiple partners.
Another difference is the level of commitment involved. Swingers may have more casual relationships with their partners outside of their primary relationship, while non-monogamous individuals may have more long-term, committed relationships with multiple partners.
It is also worth noting that non-monogamy can take many different forms, such as polyamory (meaning "many loves"), where people have romantic relationships with multiple partners at the same time with the knowledge and consent of all involved, or open relationships, where people have romantic relationships with other people outside of their primary relationship but do not necessarily consider themselves to be polyamorous. Swinging is one specific type of non-monogamy that focuses on recreational sexual activity.