Okay kiddo, let me tell you about "vyaz" in Cyrillic calligraphy. Vyaz is a special way of writing in Russian and some other Slavic languages. It's called vyaz because it looks like the letters are tied together, kind of like they are weaving or braiding.
Vyaz can be very fancy and decorative, with lots of loops and curves. But it can also be hard to read sometimes, especially if you're not used to looking at it.
So why do people use vyaz? Well, in the olden days, before people had fancy computers and printers, they would write things by hand. And if they wanted a document to look really important, like a royal decree or a religious manuscript, they might use vyaz to make it extra fancy.
Nowadays, people might use vyaz to decorate things like invitations or posters. Or they might just like the way it looks and want to learn how to write it for fun!