With global markets struggling, here’s what to know about bull and bear markets and if it's worth the financial investment in either one.

A bear market occurs when stocks on major indexes lose at least 20% of their value for a sustained period of time. Here's how to protect your investments.

What is a bear market? A bear market occurs when a major stock index, such as the S&P 500, declines by 20% or more from a recent high and stays down for a while. One way to think