NIP-05 is like having a friend vouch for who you are. You can either vouch for yourself if you have your own website, or you can ask someone else too. What it does is link up your npub to an easy to read identifier that looks like an email address.
For example, I vouch for myself at my own domain, so I show up as @wisehodl.dev
But before I did that, I used nostrplebs.com and I was wisehodl@nostrplebs.com
In both cases, if you looked up those addresses, you'd get back my npub so you can find me.
Here's an in depth guide:
