Sushi does not mean raw fish. Sashimi is raw fish. Sushi is cooked rice, flavored with rice vinegar, sugar and salt. Sushi is filled with a variety of fresh vegetable, cooked seafood or raw fish.
There are two types of sushi: one is called nigri and the other is called maki.
Nigri is cooked seafood, raw fish or egg over a small ball of sushi rice. Maki is cooked seafood or raw fish, fresh or cooked vegetable, rolled with sushi rice in a sheet of nori (dried seaweed.)