Japanese noodles are a popular type of food in Japan. Udon, soba, and ramen are three of the most common types of Japanese noodles. Udon is a thick wheat-flour noodle that is usually served in a hot broth. Soba is a thin buckwheat noodle that is often served cold with a dipping sauce. Ramen is a thin wheat-flour noodle that is usually served in a hot broth with various toppings. All three types of noodles are popular in Japan and can be found in many restaurants.