$BTC If you are a long-term investor and a long-term holder of Bitcoin, then each halving is an increase in supply pressure that makes this currency scarce. In other words, halving needs to occur for the price of the asset to continue to rise, assuming there is stable demand.
Halving is named as such because when it occurs, approximately every four years, the reward that miners receive for mining a Bitcoin block is cut in half. As a result, those miners have less new supply to sell on the market to provide the fiat liquidity they need to fund their capital and operational costs. This means that buyers have to compete more fiercely with the coins being offered, driving the price up.