This document summarizes a seminar on cloud computing presented by Prasanta Kumar Sethy. It defines cloud computing as accessing applications over the internet and manipulating data online. The cloud refers to networks or the internet that provide remote services over public or private networks. There are different cloud computing models including Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). IaaS provides fundamental computing resources, PaaS provides development tools and runtime environments, and SaaS provides software functions through web-based access.