Serverless functions are single-purpose, programmatic functions deployed to a Function as a Service (FaaS) cloud provider. They are event-driven, and are often used to build microservices and APIs. They are called serverless because the developer does not need to manage the infrastructure that runs the code. The cloud provider automatically provisions, scales, and manages the infrastructure required to run the function.
Serverless functions are stateless and ephemeral, meaning that they do not maintain state beetween invocations and are short-lived. They are typically deployed as a separate file or container, and triggered by an event, such as an HTTP request, a message in a queue, or a change in a database. Serverless functions can be written in a variety of programming languages, including JavaScript, Python, Go, and others. The support for different programming languages varies by cloud provider.
Serverless functions are often written in JavaScript, Python, Go, and other programming languages. Each function is typically deployed as a separate file or container, and is triggered by an event, such as an HTTP request, a message in a queue, or a change in a database.
The most popular cloud providers that offer serverless functions are Cloudflare Workers, AWS Lambda, Google Cloud Functions, and Azure Functions. There are also open-source serverless platforms, such as OpenFaaS and Kubeless, that can be deployed on Kubernetes and also support serverless functions.