Serverless functions are cloud computing functions where developers write and deploy code without managing the underlying infrastructure. They are event-driven, meaning they're executed in response to specific events or triggers, such as HTTP requests, database changes, file uploads, or scheduled timers. When an event occurs, the cloud provider automatically provisions the necessary resources to run and execute the code. Once the function completes its task, the resources are released, and you only pay for the actual execution time and resources used. This approach provides scalability, cost savings, and simplified management, allowing developers to focus on writing business logic. Serverless functions have various use cases, such as media processing, user authentication, booking processing, and marketing campaigns, and are ideal for applications with varying workloads due to their cost efficiency and automatic scaling. To implement and monitor serverless functions effectively, developers need to choose a provider like AWS Lambda, Azure Functions, or Google Cloud Functions, which offer the necessary infrastructure and services. Function-as-a-Service (FaaS) powers serverless functions, enabling event-driven execution, pay-per-use billing, and automatic scaling, making it a flexible and scalable choice for application development.