They use the element of surprise and usually attack from the rear or the sides of their intended victim.
Here's another test question: How do tigers normally attack?
Most felines, including tigers, are ambush predators. They don't waste much energy on chasing prey and normally stalk it until they can get a good angle or just jump out at something that passes by. As you would expect from such predators, tigers mainly use their claws to subdue their food.