The Tsukiji market is a major commercial hub where fresh seafood is auctioned every day before being sold and eaten in the many restaurant tables of Tokyo.
The market itself is where business is done. Although accessible to the tourist, it is not necessarily the friendliest place in Japan. Also it is set to move to a new location in the future which won’t be as conveniently located.
Beside the main market lies the Tsukiji outer market. This a much more friendly place where many shops and restaurants cater to tourists. Of course, you can find plenty of restaurants serving fresh fish there. Probably one of the best place to eat sushi in Tokyo!