The fastest-growing segment of the market is cloud system infrastructure services (infrastructure as a service or IaaS), which is forecast to grow 27.6 percent in 2019 to reach $39.5 billion, up from $31 billion in 2018 (see Table 1).
By 2022, Gartner expects that 90 percent of organizations purchasing public cloud IaaS will do so from an integrated IaaS and platform as a service (PaaS) provider, and will use both the IaaS and PaaS capabilities from that provider.
“Demand for integrated IaaS and PaaS offerings is driving the next wave of cloud infrastructure adoption,” said Sid Nag, research director at Gartner. “We expect that IaaS-only cloud providers will continue to exist in the future, but only as niche players, as organizations will demand offerings with more breadth and depth for their hybrid environments. Already, strategic initiatives such as digital transformation projects resulting in the adoption of multicloud and hybrid cloudfuel the growth of the IaaS market.”
Table 1. Worldwide Public Cloud Service Revenue Forecast (Billions of U.S. Dollars)
| 2017 | 2018 | 2019 | 2020 | 2021 | |
| Cloud Business Process Services (BPaaS) | 42.2 | 46.6 | 50.3 | 54.1 | 58.1 |
| Cloud Application Infrastructure Services (PaaS) | 11.9 | 15.2 | 18.8 | 23.0 | 27.7 |
| Cloud Application Services (SaaS) | 58.8 | 72.2 | 85.1 | 98.9 | 113.1 |
| Cloud Management and Security Services | 8.7 | 10.7 | 12.5 | 14.4 | 16.3 |
| Cloud System Infrastructure Services (IaaS) | 23.6 | 31.0 | 39.5 | 49.9 | 63.0 |
| Total Market | 145.3 | 175.8 | 206.2 | 240.3 | 278.3 |
BPaaS = business process as a service; IaaS = infrastructure as a service; PaaS = platform as a service; SaaS = software as a service
Note: Totals may not add up due to rounding.
Source: Gartner (September 2018)
Software as a service (SaaS) remains the largest segment of the cloud market, with revenue expected to grow 17.8 percent to reach $85.1 billion in 2019.
“The increasing adoption of SaaS applications and other cloud services impacts the management, dissemination and exploitation of enterprise content,” Craig Roth, research vice president at Gartner. “Organizations are steadily — but not exclusively — shifting their content environments to SaaS. Gartner expects that by 2019, the current enterprise content management(ECM) market will devolve into purpose-built, cloud-based content solutions and solution services applications.”
In the business process as a service (BPaaS) category, Gartner forecasts a revenue growth of 7.9 percent, to reach $50.3 billion in 2019. Gartner found that especially in this category, buyers increasingly expect deep domain expertise, technology and global deployment capabilities from their providers as well as service portfolios that bridge legacy offerings and support new automated, digital and cloud service delivery paradigms.
