Altseason is a term used in the cryptocurrency community to describe a period of sustained growth in alternative (alt) coins, at the expense of bitcoin. The word is a portmanteau of "alternative" and "season." During an altseason, bitcoin's market dominance typically decreases as investors pour money into altcoins in search of bigger gains. Ethereum, Binance Coin, and Solana are among the altcoins that have outperformed bitcoin during previous altseasons. The exact definition of an altseason varies, but generally speaking, it refers to a period when altcoins experience significant gains against bitcoin. Altcoins are often bitcoin's biggest rivals, so an increase in their prices usually comes at bitcoin's expense. While bitcoin is still the largest cryptocurrency by market capitalization, its dominance has been declining in recent years as more investors have turned their attention to altcoins. This trend is likely to continue during future alt seasons.