Kubectl is a command-line tool used to interact with Kubernetes clusters. Contexts in Kubectl are useful when working across multiple clusters or as multiple users using a single Kubectl installation. They allow you to store each cluster's access parameters as named profiles in a single Kubeconfig file, making it easier to switch between environments without having to supply extra information each time. This guide covers setting up and using Kubectl contexts, modifying existing ones, deleting them, and troubleshooting common issues related to contexts.