I saw someone ask what Photon is, so I decided to make a sticky post for this.
Photon is an alternative client for Lemmy.
You probably have heard of "clients" like Sync for Lemmy and Jerboa, Connect, etc. Photon is another client, but instead of being an app, it is a web app. You can essentially use it as a website, by going to https://phtn.app . It's like the client Voyager.
The part that confuses a lot of people is that some people self-host Photon for their instance. Instances can host their own version of Photon if they wish, and can set a setting to add some flair for that specific instance. This is still "photon", it's just on a different domain and linked to that instance essentially.
Photon is currently one of the only clients with full feature-parity to the default interface, lemmy-ui.
Link to this post if someone asks what Photon is.