An iOS device running iOS 10 and later can send cool bubble and screen effects. You use these effects get your message across to other fellow iMessage users. With bubble effects, you can slam down your message or hide it in invisible ink. With screen effects, you can send balloons or fireworks.
When you use a tv network app you need to sign in with your cable provider by going to a website, typing in a code, then finally sign in with your provider and you may have to do this often which can be a pain. Instead, use Apple's single sign in and never have to worry about those steps again. Sign in once and go.