Pulumi is an infrastructure-as-code platform that enables full-stack developers and cloud engineers to use general-purpose programming languages for their cloud resources. It consists of Provider SDKs, a CLI, and a Service backend. Pulumi supports four popular programming languages: Go, JavaScript/TypeScript, Python, and .NET Platform (C#, F#, VB). The platform allows users to create cloud resources using general-purpose code, maintain homogeneous codebases, and automate execution of Pulumi apps. Key features include ComponentResources, StackReferences, Dynamic Providers, and Automation API.