Our experts answer readers' investing questions and write unbiased product reviews (here's how we assess investing products). Paid non-client promotion: In some cases, we receive a commission from our partners. Our opinions are always our own.

Cryptocurrencies like bitcoin have been around for more than a decade, but in the past few years, they've moved beyond a niche investment to the mainstream. Companies such as Microsoft, Amazon, Starbucks, Whole Foods, Paypal, and countless others now accept bitcoin and other digital currencies as forms of payment.