Beta is a measurement of how volatile a stock is relative to a broad market index. For example, the S&P 500 Index has a beta of 1, and the beta for every stock is relative to that. A stock that swings 10% more than the index has a beta of 1.1.
Low beta stocks often hold up relatively well in turbulent markets because the companies tend to have steady earnings growth and reliable dividends.
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Here are a few example stocks with low betas -