In Japan, there are two main types of Japanese food, Western and Japanese. You might be confused as in why Western food is considered Japanese food. In Japan, there are foods called Yousyoku (洋食 *ようしょく), which literally translates to west food. Yousyoku is a little different compared to the food you find in Europe or America. They are based on Western food but altered to have more of a "Japanese" taste to it. America also does the same thing actually. Even though we have pizzas and pastas over here, they are actually altered to fit our tastes and are different from the ones you find in Italy. Similarly, this is what Yousyoku is. Some examples are Japanese style pastas, curry, omurice (オムライス), and hamburger (ハンバーグ). Omurice is based off omelets but has rice stuffed inside. When I said hamburger, you might have thought of the one commonly sold at McDonalds. However, it is not that hamburger (in Japanese it is called バーガー). It is actually a blend of ground beef and other ingredients. In English, it is commonly known as salisbury steak. The second category is Wasyoku (和食 *わしょく), which literally translates to Japanese food. This type of food is the exact opposite of Yousyoku. Wasyoku is food created in Japan such as soba, sushi, and udon. In Japan, there are all kinds of foods you cannot find in other places of the world. Even if there are foods based off of Western foods, it has a whole new taste to it.
Sushi (寿司 *すし) is world known. However, sushi in Japan is different from the ones in American. Like I mentioned above, most of the American sushi shops altered their flavor to please their American customers. It is different compared to sushi in Japan. Also, there are the cheap market sushi and the actually professionally created sushi. There is also sushi shops called Kaitenzushi (回転寿司 *かいてんずし=literally means rotating sushi). Sushi on plates are put on conveyor belts. Then, the customers take the sushis off the conveyor belts.