Amazon Web Services (AWS) is the world's most comprehensive and broadly adopted cloud that includes infrastructure as a service (IaaS) and platform as a service (PaaS) offerings.
Azure is a cloud computing platform and an online portal that allows you to access and manage cloud services and resources provided by Microsoft.
GCP is a public cloud vendor that offers a suite of computing services to do everything from data management to delivering web and video over the web to AI and machine learning tools.