Halving
A scheduled event that halves the block reward paid to bitcoin miners, roughly every four years.
A halving is a programmed event in the bitcoin protocol that cuts the new bitcoin issued per block in half. It occurs about every 210,000 blocks, which is roughly every four years. Because new supply falls, the change affects miner revenue and the rate at which new coins enter circulation.
On our site, halving dates are shown on the bitcoin timeline with a countdown. Price patterns around past halvings are widely discussed, but a historical pattern is not a forecast.
Traders care because a halving changes the supply schedule and miner economics, and the date is known well in advance, so markets may move before it. The size of the effect is debated and it is one factor among many.
Worked example (illustrative numbers, not real data): if miners receive 3.125 coins per block and there are about 144 blocks per day, daily issuance is 450 coins. After a halving, the reward is 1.5625 coins per block and daily issuance is 225 coins.