I'd be happy to explain what a Serverless Function is and how you can use it.

A Serverless Function is a cloud computing model that allows you to build and run applications and services without having to manage infrastructure or your own dedicated servers 1. Despite the name, servers are still used, but the management of these servers is abstracted away from the developer.

Here are some key points about Serverless Functions:

1. On-demand execution: When a request is made, a virtual machine on a server is spun up to handle the request, and then spun down when the request is complete 1.
2. Scalability: This model allows your app to handle unpredictable traffic patterns efficiently.
3. Cost-effective: You only pay for the compute resources you actually use, rather than paying for idle server time 1.
4. Focus on code: Developers can focus on writing code rather than managing infrastructure.

Now, let's look at how you can use a Serverless Function in practice. I'll demonstrate this using a Next.js application, which is well-suited for deployment on Vercel's platform.

In this example:

1. The app/api/hello/route.ts file defines a Serverless Function. When deployed on Vercel, this function will be executed in a serverless environment.
2. The app/page.tsx file contains a button that, when clicked, calls the API (our Serverless Function) and displays the response.

To use this:

1. Deploy your Next.js application to Vercel.
2. Vercel will automatically detect the API route and deploy it as a Serverless Function.
3. When a user interacts with your application and the button is clicked, the Serverless Function will be invoked.

This demonstrates how Serverless Functions allow you to create backend logic without managing servers, seamlessly integrating with your frontend code.

Remember, while Serverless Functions offer many advantages, they also have some limitations:

1. Cold starts: There can be a slight delay when a function hasn't been used recently 1.
2. Maximum duration: There's typically a limit on how long a single function execution can last 1.
3. Statelessness: Serverless Functions are stateless, so you need to use external services for persistent storage.

Despite these considerations, Serverless Functions are a powerful tool for building scalable, cost-effective applications. They're particularly well-suited for microservices, APIs, and event-driven programming.