When a block is successfully mined on the bitcoin network, there is a block reward that helps incentivize miners to secure the network. The block reward is part of a “coinbase” transaction which may also include transaction fees. The block rewards halves roughly every four years; see also “halving.”
The reward given to a miner which has successfully hashed a transaction block. This can be a combination of coins and transaction fees, depending on the policy used by the cryptocurrency in question and whether all of the coins have been successfully mined. The block reward halves when a certain number of blocks have been mined. In Bitcoin’s case the threshold is every 210,000 blocks, or approximately every four years. The block reward for Bitcoin was originally 50 bitcoins. Bitcoin currently awards 25 bitcoins for each block.
Malone, J.A (2015). Glossary of Bitcoin Terms and Definitions. United States: Lulu Press, Inc