Definition
A bear market is a prolonged period where stock prices fall and investor confidence weakens. The 20% threshold is a common definition, but the key is that it feels like things are going wrong. Bear markets test your resolve because headlines get scary and the temptation to sell is high. They also don't last forever, though they feel like they might.
Why it matters
Bear markets reveal who has an actual plan and who's just winging it. Investors who panic sell lock in losses and often buy back in after prices recover, guaranteeing they lose money. Investors with a long-term plan who keep investing (or do nothing) tend to come out ahead. The 2020 COVID crash was brutal but recovered in months. The 2008 financial crisis took longer but still fully recovered by 2013. Staying disciplined is the hardest part.
Quick example
In early 2020, the S&P 500 dropped from 3,386 to 2,191 in weeks (35% loss). That was a severe bear market. Investors who panicked sold near the bottom and missed the 50% recovery over the next six months. Investors who stayed put or kept contributing made their money back and then some.
The bottom line
Knowing what Bear Market means helps you make better day-to-day money decisions. It makes rates, account options, and tradeoffs easier to compare.