These investments combine high yields and low volatility.Volatile market swings can rattle investors who focus on growth stocks, but there's a type of stock whose prices don't tend to swing as widely as shares do in the broader market: real estate investment trusts (REITs).REITs give investors exposure to various types of real estate holdings. Some exclusively invest in data centers, while others focus on multifamily housing or triple-net retail properties. And most offer relatively high yields.Not all REIT ...