Cascading reels technology is a feature in modern slot machines and online video slots that differs from traditional spinning reels by having symbols drop into place from above. Winning combinations disappear after payout, allowing new symbols to fill the gaps and potentially generate more wins in a single spin. This technology uses a random number generator (RNG) to ensure fairness in determining outcomes. Cascading reels provide multiple winning opportunities in each round and often include special features like multipliers or extra free spins, enhancing gameplay and maintaining player engagement, making it highly popular in the gaming industry.