Mining pool is a mining service, which allows multiple users combine their mining powers to generate one block and split the reward. As a result users get smaller rewards continuously compared to solo mining.
Cryptocurrency exchange is a service to buy and sell Rawcoin for bitcoins. The exchange rate fluctuates real-time based on the demand and supply from other users.
Block explorer is a service which helps browse Rawcoin's blockchain and the information it contains. It shows all the blocks generated with all the transactions in each block, but not their senders or recipients.