Tech companies dominated the 2010s, with the FANG stocks (Facebook, Amazon, Netflix, Google) helping the S&P 500 return more than 350% over the course of the decade. The index would have done even better had it included Domino's Pizza, which is also a tech company.
Why it matters: These companies don't look like the tech firms of earlier decades. They don't manufacture computer hardware; neither do they sell software. They don't even make high-tech planes, like Boeing, or high-tech cars, like Tesla.