Function as a Service (FaaS): Core Building Block of Serverless Technology What is FaaS? Simplest unit of work for building applications, microservices, or event-driven protocols Basic workflow: Input → Logic → Output Characteristics of FaaS Simple and easily understandable Highly scalable Quick response time Popular FaaS Framework: AWS Lambda Can be attached to various services: S3 notifications (e.g., file uploads) SQS (Simple Queue Service) messages Enables building infinitely scalable services with small response times Best Languages for Serverless/FaaS Rust Go Advantages of Modern Compiled Languages for FaaS Speed Safety Optimal deployment characteristics Millisecond response and invocation times Low energy usage Key Considerations for FaaS Development Focus on maintenance over ease of building Optimize for low costs (financial and energy) Consider total cost of service over time Takeaway When developing Function as a Service applications, prioritize long-term efficiency, maintenance, and cost-effectiveness over initial development ease.