Netlify is highlighting a different feature each day throughout December, and one of them is Netlify Functions, which simplifies building, deploying, and versioning serverless functions. With Netlify Functions, you can add files containing your functions to a netlify/functions folder in your project directory, push them to your project repo, and deploy them to AWS Lambda with complete control over the URL design. This feature allows developers to deliver full-stack capabilities without having to learn all the necessary skills, making it easier to build and maintain serverless applications.