Halving - halving the reward for Bitcoin miners. It is necessary for the network to maintain overall the number of bitcoins, which will not exceed 21 million coins.
Bitcoin halving is planned by block height, not by date.
Every four years, the number of bitcoinswhich rewards the mining of the next block is halved: at first it was 50 bitcoins, then 25, and then 12.5. In 2020, it will already be 6.25 bitcoins (halving of 2020 will occur on the block 630,000). Thus, if governments are constantly increasing their money supply, the Bitcoin algorithm acts in the opposite way, preventing inflation.
It is expected that this process will end in 2140, when all bitcoins will be mined.
Below is a table (information on halving dates):
Regards, BitJackass (https://t.me/BitJackass).