A bull market is a period of time where there is a general rise in the stock market, with a sustained increase in the prices of stocks. During a bull market, investors are more willing to invest and there is an increase in trading volume.
The last bull market lasted from 2003 to 2007.
The S&P 500 increased by 20% during the last bull market.
During a bull market, there is an increase in trading volume, higher valuations, increased liquidity, and an increase in initial public offerings.