Cloud computing is the delivery of computing services over the internet. These services include servers, storage, databases, networking, software, and analytics. It allows individuals and businesses to access and use technology resources without having to own or manage the physical infrastructure. This approach offers flexibility, scalability, and cost savings, as users pay only for the services they use.

PaaS (Platform as a Service) provides a platform allowing customers to develop, run, and manage applications without dealing with the infrastructure typically needed for app development. It simplifies the process of app development by providing the necessary tools and software over the internet.

SaaS (Software as a Service) delivers software applications over the internet on a subscription basis. Users can access software from any device with an internet connection, without the need to install or maintain the software on their own systems.

IaaS (Infrastructure as a Service) offers virtualised computing resources over the internet. It provides essential compute, storage, and networking resources on demand, allowing users to run and manage operating systems and applications without having to purchase and maintain physical servers.