Function as a Service (FaaS) is a cloud computing model that allows developers to run individual pieces of code, or functions, in response to specific events without managing servers. This means that developers can focus on writing code while the cloud provider handles the infrastructure, scaling, and execution of the functions as needed. FaaS is part of the broader serverless computing paradigm, which simplifies application development by abstracting server management. Users are charged only for the actual execution time of their functions, making it a cost-effective solution for applications with variable workloads.