Karen London, PhD, clears up some behavioral vernacular and addresses opportunities and issues of dog parks. She says only puppies can be socialized in the technical sense, but adult dogs can benefit from social interaction.
Source: The BARk, March 2020. Link. Not all dogs need to be around other dogs or benefit from being social in the general sense, but many do. It’s great for dogs who like other dogs and can play appropriately to spend time at the dog park, as long as it is one where people behave responsibly and there’s enough space.