Lemmy is a part of the Fediverse, a global network of participating social media platforms that can federate and exchange comments and posts with each other, like how you can send email between different email services. Other Fediverse platforms you may have heard of are Mastodon, Misskey, Pixelfed, and many more! Anyone can host their own Lemmy website, called an instance, and that instance can then federate with other instances to access their communities and posts. To find communities and instances, check out https://lemmyverse.net

If you prefer the old Reddit design, check out https://old.lemmy.world