A bazaar is a market that has rows and rows of little shops selling miscellaneous stuff — like tube socks, velvet paintings, and corn on the cob.
Bazaar is originally a Persian word, and means "marketplace" all over the Middle East. The word was picked up by the Italians, and spread through Europe and into English. At a bazaar in Istanbul, you'd find food, electronics, clothes — useful stuff. In English, we tend to use bazaar for something closer to a flea market. Although they sound alike, bazaar has no relation to bizarre (the super weird).