Kadıköy, known in classical antiquity and during the Roman and Byzantine eras as Chalcedon, is a large, populous, and cosmopolitan district in the Asian side of Istanbul, Turkey, on the northern shore of the Sea of Marmara. It partially faces the historic city centre of Fatih on the European side of the Bosporus. Kadıköy is also the name of the most prominent neighbourhood of the district, a residential and commercial area that, with its numerous bars, cinemas and bookshops, is the cultural centre of the Anatolian side of Istanbul. 

Kadıköy is a busy shopping district, with a wide variety of atmospheres and architectural styles. The streets are varied, some being narrow alleyways and others, such as Bahariye Caddesi, being pedestrian zones. 

Turkey's biggest food market is there, starting next to the Osman Ağa Mosque, and has an immense turnover of fresh foods and other products from all around Turkey, including a wide range of fresh fish and seafood, olive oil soap, and so on.

- Wikipedia