Pulumi is an infrastructure as code tool that allows users to define cloud infrastructure using familiar programming languages like Go, Python, or JavaScript, and it integrates well with Octopus Deploy for deployment automation. The article demonstrates how to create an Azure resource group using a Pulumi project written in Go, detailing the steps from setting up the necessary accounts and configurations to writing and executing the code. Pulumi offers a multi-language platform to build cloud services by utilizing SDKs that interact with various cloud providers, enabling users to efficiently manage resources such as virtual machines and serverless implementations. The article also provides a code example to illustrate how Pulumi can be used to create Azure resource groups, emphasizing the tool's flexibility and power in deploying infrastructure using a preferred programming language. Additionally, it highlights the ease of integrating Pulumi projects into different environments, whether Windows or Linux, using Octopus Deploy's community steps.