According to Gartner (April 2019), the worldwide public cloud services market size was US$182.4bn in 2018 and projected to grow by 17.5% YoY to US$214.3bn in 2019. In terms of service type, SaaS market accounted for the largest proportion while smaller IaaS market was quite concentrated. In 2018, three big giants, Amazon (AWS), Microsoft (Azure), and Alibaba accounted for 47.8%, 15.5%, and 7.7% of the global IaaS market share
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