My Number Card Question

EDIT: Thank you for all of the answers, I will go to my town hall and work on getting a My Number Card😅

I moved to Japan a few months ago and currently have a 3 year Spouse visa. My husband has a My Number Card as he is a citizen, but I just have my Visa card. I just saw a video of a foreigner renewing their My Number Card. I didn’t know even know a foreigner COULD get a My Number Card😭😭 Do I need to get one?? What is the difference in the My Number Card and my Visa Card?

So sorry if this is a dumb question, I’m just confused and google is not helping me understand😩