A range of factors have encouraged investors to hit the 'sell' button.
Here are 4 tips for today's trading. This will help you decide where you should invest and what to look for:
1. Stocks in the red
1. Stocks in the red
Monday's sell-off began in Asia, where every major index posting sizable declines. Japan's Nikkei index led the retreat, shedding 3.5%, while the Shanghai Composite followed with a 3.2% drop. Hong Kong's Hang Seng index dropped 2.6%.
European markets are falling in early trading, with most key indexes down by more than 1% or more. Major indexes in the Middle East are in the red.
U.S. stock futures are also declining. Concerns about the global economy, and uncertainty over next week's U.K. referendum on whether to exit the European Union, are weighing on markets.
Investors are treading warily ahead of a series of important central bank meetings this week. The U.S. Federal Reserve makes its latest interest rate decision on Wednesday and a policy announcement is also due from the Bank of Japan.
Sentiment may also be depressed by the mass shooting in Orlando, Florida that killed at least 50 people. It was the deadliest mass shooting in U.S. history.
2. Bonds, currencies, commodities
2. Bonds, currencies, commodities
Overall aversion to risk is causing shifts in bond, currency and commodity prices.
Investors are putting their money in U.S. bonds as they seek a safe haven, sending yields down to slip to 1.63%. They're also buying up the Japanese yen, which is making the currency rally.
And the British pound is declining versus all major currencies due to uncertainty about the outcome of the U.K. referendum.
In the commodities world, oil prices are slipping to trade below $49 per barrel.
3. Focus on Apple
3. Focus on Apple
Apple is set to unveil its latest advancements at its annual World Wide Developers Conference on Monday.
Apple's keynote address, at 10 a.m. PT in San Francisco, will kick off the event.
But there probably won't be any shiny new hardware or fresh gadgets on display because this is an event for developers. Apple's big announcements are expected to focus on software like Siri, Apple Music and its operating system.
4. Friday market recap
4. Friday market recap
Stock markets took a dive at the end of last week. On Friday, the Dow Jones industrial average shed 0.7%, while the S&P 500 dipped 0.9% and the Nasdaq lost 1.3%.
