Although soba is the Japanese term for buckwheat, the word typically refers to thin buckwheat noodles. The noodles are usually prepared for numerous hot and cold dishes, and can be consumed at both fast food stands on railway stations and in expensive restaurants.
Soba is commonly eaten with chopsticks, and it is recommended to slurp the noodles while making loud noises, as it's a part of common culture in Japan. Eating soba dates back to the Edo period, when every part of town had a few soba establishments, which were used as today's bars.
Of course, there are also regional soba dishes such as wanko soba (Iwate prefecture), ita soba (Yamagata prefecture), matcha soba (Uji), and nishin soba (Kyoto prefecture). In order to prepare pure buckwheat noodles that don't crack and fall apart requires the skills of a true soba master.