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SaaS, PaaS, and IaaS in cloud computing represent the three primary cloud service models that deliver software, development platforms, and infrastructure over the internet. SaaS provides ready-to-use applications, PaaS offers development and deployment environments, and IaaS supplies scalable virtual infrastructure. Together, these models help businesses reduce IT costs, improve flexibility, and accelerate digital transformation. While SaaS delivers cloud-based applications, PaaS provides a managed platform for developers, and IaaS offers virtualized servers, storage, and networking. Each model supports cost savings, scalability, and improved collaboration for startups and enterprises alike.