Boom

What Does Boom Mean?
A period of time during which sales or business activity increases rapidly.

Investopedia explains Boom
In the stock market, booms are associated with bull markets. Conversely, busts are associated with bear markets. The cyclical nature of the market and the economy in general suggests that every bull market in history has been followed by a bear market.

The internet technologies boom in the late '90s was one of the largest booms in history (followed by one of the biggest busts in history).