For a new token or just finished from the ICO process, this will provide a good pump for tokens received by large exchanges such as Binance or Bittrex.

In addition, an exchange will make it easier for users to exchange money for money fiat. An exchange like binance or kraken and bittrex are very popular with traders cryptocurtency because they have a high volume compared to local exchange which is only used by a few users. I guess an exchange has no special function that will provide cryptocurrency, such as an increase in price. Only a place to facilitate cryptocurrency users.