600+ Pairs
9+ Markets
999+ Pairs
99+ Markets
20+ Pairs
6 Markets
200+ Pairs
4+ Markets
16 Pairs
2 Markets
200+ Pairs
4+ Markets
999+ Pairs
99+ Markets
200+ Pairs
3+ Markets
250+ Pairs
4 Markets
200+ Pairs
3+ Markets
50+ Coins
Bitcoin Exchanges are Websites where you can Exchange your Bitcoin into FIAT (USD/EUR) or Trade your Bitcoin for other Altcoins. The first Bitcoin Exchange was Mt.GOX in 2011.
... Do I need a Exchange?
If you dont want to sell your Crypto you dont need a Exchange Account but at some Point everyone want to take some Profits so you need them at some point except you sell your Bitcoin private!