The top cloud service providers in terms of market share and popularity as of September 2021 are:
1. Amazon Web Services (AWS): AWS is a subsidiary of Amazon and is the largest and most widely adopted cloud service provider in the world. It offers a vast array of cloud computing services, including computing power, storage options, and networking capabilities.
2. Microsoft Azure: Microsoft Azure is a cloud computing platform by Microsoft that provides a wide range of services, including virtual machines, databases, AI and machine learning tools, and more. It is a strong competitor to AWS and is widely used by businesses of all sizes.
3. Google Cloud Platform (GCP): GCP is Google’s cloud computing service, offering cloud storage, data analytics, machine learning, and other services. Google’s expertise in big data and AI makes it an attractive option for organizations in those fields.
4. IBM Cloud: IBM Cloud provides a comprehensive suite of cloud computing services, including AI, data analytics, and blockchain capabilities. It caters to a wide range of industries and enterprises.
5. Alibaba Cloud: Alibaba Cloud is the cloud computing arm of Alibaba Group, one of the largest e-commerce companies in the world. It primarily serves the Asian market but has been expanding globally and offers a variety of cloud services.
6. Oracle Cloud: Oracle Cloud offers a suite of cloud-based applications, platform services, and infrastructure services. It focuses on database solutions and enterprise applications.
7. Tencent Cloud: Tencent Cloud is a cloud service provider based in China, and it offers a wide range of cloud computing services, including data storage, networking, and AI.
Please note that the cloud computing industry is highly dynamic, and the ranking of providers might have changed since my last update. Additionally, there may be new players or shifts in market share. It is always a good idea to check the latest information and conduct thorough research before choosing a cloud service provider for your specific needs.

