Can anyone enlighten me?
That’s a very thoughtful question — happy to clarify 
In cloud computing architecture, the major contributors typically fall into a few broad categories:
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Infrastructure providers – organizations that build and operate large-scale data centers, networking, and core compute resources.
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Platform providers – those offering managed services such as databases, container platforms, analytics, and development environments.
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Software (SaaS) providers – companies delivering applications that run on cloud infrastructure.
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Consulting and managed service partners – teams that design, implement, and optimize cloud solutions for businesses.
It’s often more helpful to evaluate providers based on architecture strengths — scalability, reliability, security standards, automation capabilities, and global reach.
May I ask if you’re exploring this from a learning perspective, comparing providers, or planning an infrastructure project? That would help tailor the explanation better for you.