Definition: “Bull” and “bear” are Wall Street terms used to describe the performance of the stock market. A bull market is when stocks are rising, and a bear market is when stocks are falling. It’s hard to predict when the markets will turn from bull to bear or back again. Your best bet is to invest in stocks in accordance with your risk tolerance and stay the course.
Key Takeaway: A bear market can be more dangerous to invest in, as many equities lose value and prices become volatile
Fun Fact: The terms "bear" and "bull" are thought to derive from the way in which each animal attacks its opponents. That is, a bull will thrust its horns up into the air, while a bear will swipe down. These actions were then related metaphorically to the movement of a market. If the trend was up, it was considered a bull market. If the trend was down, it was a bear market.
Watch the video below for another look at this concept.
Bear Market vs Bull Market Explained (Investopedia)