Sani Dev is a name of a god which is pray by Hindu people. There is 9 planet in universe Sani is one of them like earth.
If people pray sani dev then bad effect by Sani will be reduce and man got happy his life.
The Sani Mahamantra is given below.
Om Shan Sanischarai Namaha..
Om shan sanischarai namahaaccording to Hindus epic read this chant 108 times when you felt trouble in life ,then you will be far from death too.
hm ! Tryambakam Yajamahe Sugandhim Pusti wardhanam !
Urwa Rukmeeba Bandanan mrityor moksheya mammritat"!!