Depending on your server, and how you install you might have a bad experience. I’ve had issues where it wasn’t finding the film/series metadata, having plugin issues, and being incredibly slow (slow UI when anything is being done, slow scanning folders, slow loading saved metadata, etc). Jellyfin, like a lot of open source software, feels like jank. The devs know about a lot of issues, but they’re swamped with so much, with this big of a project.
People criticise Plex, rightfully so with some of their bad decisions, but it still works better. For me, Plex runs so much better, and without issues. I won’t be moving away to Jellyfin in the foreseeable future, but I’ll be glad when I am able to.
Others have done a good job at explaining what this is. Though, a quick tip.
If you’re ever unsure about what a component is, do a quick search for what those chips are. In this case, I see several Asmedia asm1081. In 5 minutes you should know more about that component.