Sushi and sashimi are both Japanese fish dishes.

Sushi means slices of raw fish, mixed with, laid over or wrapped in or around special sushi rice (rice with vinegar).

Sashimi is simply the raw fish, often sliced very thinly.

Although the definitions seem simple, hundreds of variations exist in Japanese cuisine. Some classes of sushi commonly served in Japanese restaurants are:

• hosomaki, or thin sushi rolls
• futomak,i or thick sushi rolls
• maki-sushi, or sushi rolls wrapped in seaweed
• charkin-sushi, or sushi with thin slices of omelette

Both sushi and sashimi are normally served with common side dishes, such as wasabi (horseradish), ginger, radish, rice vinegar, soy sauces or other sauces.

Sushi
(Source http://www.gridskipper.com/travel/menu-sushi.jpg)

Sashimi
(Source: http://www.er.uqam.ca/pasteur/e342674/images/sashimi.jpg)