UV Lens Filters. What are they? And do you need one? 

Here's a couple of links to the accessories that I can't do without.*
Peak Design Slide
UK - amzn.to/3f3aBYh
US - amzn.to/3zC3miq
Peak Design CL-3 hand strap
UK - amzn.to/3iRPbyD
US - amzn.to/3t6LgCQ
Benro Carbon Fibre Monopod
UK - amzn.to/38wyiVe
US - amzn.to/3mTqUM6
UV filters I have in my camera bag:
UK - amzn.to/3Cf5w9w amzn.to/3fr58dX
US - amzn.to/3jzEhiA amzn.to/3yAO6RF
*If you purchase through these links, I will get a small commission from the sale, so thank you in advance, I really do appreciate the help.
What is a UV lens filter? At one point, you almost couldn't leave a camera store without buying a spare UV lens filter... "Sure you haven't forgotten something sir?"
But in 2021, what do they do now? And more to the point, do you actually need a UV lens filter for your lens?
After much soul searching and research, I've finally come up with the difinitive answer...
Let me know in the comments if you used to use a UV filter, do still, or maybe you're thinking of buying one.