The terms “henna” and “mehndi” are used interchangeably.
But are they really the same thing?
Henna is the paste you use to decorate your hands.
Mehndi is the design it leaves behind. But in practice, you can call the paste mehndi or the design henna.
So let loose! Go crazy! Throw around the terminology willy-nilly! It’s your wedding – you do you!