The AWS Lambda Web Adapter is an open-source project that simplifies migrating web applications to AWS Lambda, allowing developers to use familiar frameworks like Express.js, Flask, SpringBoot and more. The adapter works by acting as a bridge between the web application and the AWS Lambda environment, listening for incoming requests, processing them, and forwarding them to the internal HTTP server. This enables developers to continue using their preferred tools and practices while benefiting from the scalability and cost savings of running their application on AWS Lambda. The adapter also supports consuming AWS services such as Secret Manager and integrates with Gunicorn, a Python Web Server Gateway Interface (WSGI) HTTP server that serves Python web applications by managing communication between the web server and the application. By using the Lambda Web Adapter, developers can save time in migrating applications and enjoy improved security measures and more efficient static file serving.