The cloud is big business for tech giants like Amazon, Google and Microsoft. Revenues from cloud services are expected to exceed $200 billion in 2019. But what exactly does the cloud do? CNBC’s Elizabeth Schulze explains. ----- Subscribe to us on YouTube: http://cnb.cx/2wuoARM Subscribe to CNBC Life on YouTube: http://cnb.cx/2wAkfMv Like our Facebook page: https://www.facebook.com/cnbcinternational Follow us on Instagram: https://www.instagram.com/cnbcinternational/ Follow us on Twitter: https://twitter.com/CNBCi