Hello, I have only heard about Shifer and Witer when I was about 11 and ever since I have been praying them. I asked my mom one time and she says its required to do after salat Isha. When I was recently praying Isha with my friends, I asked if they prayed or even knew about Shifer and Witer. Their response was no. Everyone my age doesn't even know what it is. So my question is if Shifer and Witer is required?