Cryptocurrency exchanges

There are many exchanges where users can buy or sell Bitcoins and other Altcoins. Exchanges can deal in fiat money, Bitcoin, Altcoins, commodities, or all of these. These exchanges usually charge a small fee for the trade done on their platform. Some of the popular Cryptocurrency exchanges are these:

• Binance: One of the top exchanges in the world, having more than 150 Altcoins listed on it, increasing day by day. It is one of the most active cryptoexchanges.
• Huobi: Another popular exchange, founded in September, 2013. It is one of the largest exchanges in China. More than 250 coins are listed on the Huobi exchange.
• Bithumb: One of the largest cryptoexchanges based in South Korea, with a huge daily trading volume. Bithumb does not list a vast number of coins; as of now, only 20 coins are listed on Bithumb.
• Bitfinex: Hong Kong-based cryptocurrency exchange owned by iFinex, Inc. More than 75 coins are listed on Bitfinex.
• OKEx: One of the largest cryptoexchanges, with more than 500 coins listed on its platform. Started in 2014, it is also known for BTC futures trading, in which it generates huge daily volumes.
• Kraken: One of the first Bitcoin exchanges, started in 2011. It has been through lot of security breaches in mid of 2017 but has been stable post that. Kraken provides Bitcoin pricing to the Bloomberg terminal.
• Cex.io: A popular cryptocurrency exchange founded in 2013. Formerly known for cloud mining services. The mining pool of Cex.io know as Ghash.io contributed over 42% in Bitcoin mining hash rate in 2014.
• Bitstamp: One of the oldest exchanges started in 2011. It is most popular for fiat to cryptoexchanges. 
• HitBTC: A UK based cryptocurrency exchange started in 2015. It supports a vast list of currencies.
• Upbit: A south korea based cryptocurrency exchange offering fiat deposit in South korean won.
• Bittrex: It is a US based cryptocurrency exchange founded in 2013. It works with a vast amount of crypto currencies.

Apart from the ones mentioned here, there are many other popular exchanges, some focusing primarily on fiat to cryptocurrency purchase, and others working on only cryptocurrencies. Some other prominent exchanges are Upbit, Bittrex, Lbank, Bit-Z, HitBTC, coinbase, BCEX, GDAX, Gate.io, Bitstamp, EXX, OEX, Poloniex, Kucoin, Cobinhood, Yobit and so on.