In cloud computing, Function as a Service (FaaS) is a type of cloud service that allows developers to execute code in response to events without the need to provision or manage servers. FaaS is a key component of serverless architectures, where the focus is on the application code, not on the infrastructure that runs it.

FaaS works by allowing developers to upload their code to the cloud, and then the cloud provider runs that code in response to specific events, such as a user clicking a button on a website. The cloud provider automatically manages all the infrastructure required to execute the code, including server provisioning, scaling, and patching.

Consider a weather application that fetches data from various sources and provides real-time weather updates to users. Using FaaS, the developers can write a function that fetches and processes weather data whenever a user opens the application, without having to manage the servers that run the code. This means the developers can focus on improving the application's features and user experience, rather than managing server infrastructure.