She’s a Mandalorian warrior who at one point held the Darksaber, a powerful and symbolically important weapon that was featured in the first season finale of The Mandalorian.
Even if you hadn’t seen the movies you could pretty much follow the story of Mando and his widdle buddy Baby Yoda.
The Mandalorian Season 1 was a very Star Wars-neophyte friendly season. You didn’t have to know much about the world of Star Wars to enjoy the show.
If it was only accessible to hardcore Star Wars dorks, that wouldn’t have brought in the millions of subscribers they needed.