Reward Blocks, or Block Reward, are rewards given to miners in order to keep them running.
A typical block usually contains about 2,500 separate transactions.
The Bitcoin block mining reward halves every 210,000 blocks, the coin reward will decrease from 12.5 to 6.25 coins. There is a countdown clock to check out the block reward halving.
The next Reward-Drop ETA is June 3rd, 2020.