Vercel is a cloud platform that combines the strengths of static websites and serverless functions to enable instant deployment and automated scaling of Jamstack applications with simplicity and transparency, leveraging familiar Git workflows. It's used in conjunction with Gatsby.js, a popular free and open-source framework based on React, for building fast and search engine-friendly websites. The platform integrates with GitHub, allowing developers to set up E2E testing and monitoring using Checkly, which automates the deployment process and provides real-time feedback on application performance. With Vercel and Checkly, developers can streamline their workflows, free up time for development, and focus on building high-quality applications.