Pulumi is an open-source infrastructure as code (IaC) tool that allows developers to manage cloud resources using familiar programming languages like JavaScript, Python, Go, and C#. It enables users to define, deploy, and manage cloud infrastructure in a more flexible and efficient way compared to traditional IaC tools, which often rely on domain-specific languages. With Pulumi, developers can leverage existing programming constructs, such as loops and functions, to create reusable components and automate infrastructure management. This approach helps streamline the development process, making it easier to integrate infrastructure management into existing software development workflows and improve collaboration among teams.