What is tanvin (tanween) in Persian?

Hello guys, hope you're doing well. In this video we talk about tanvin (tanween) in Persian/Farsi. We learn how to read it in some daily and useful words and we figure out where it's used. Tanvin is not a vowel itself. But it gives its previous letter the "an" sound. I tried to explain completely, but if you have any questions, please ask and I'll answer in the next videos. Btw, if you want to start learning Persian and don't know where to start, the Persian Course in the channel is made for you.