Serverless Functions
ELI5 — The Vibe Check
Serverless functions are snippets of code that run in the cloud without you managing any servers. You upload a function, pick a trigger (HTTP request, file upload, timer), and the cloud handles everything else — scaling, patching, paying only for execution time. It's like ordering food delivery instead of running a restaurant.
Real Talk
Serverless functions (FaaS) are event-driven compute units that execute in managed, ephemeral containers. Major implementations include AWS Lambda, Google Cloud Functions, Azure Functions, and Cloudflare Workers. They automatically scale from zero to thousands of concurrent executions, charge per invocation/duration, and abstract away all infrastructure management.
When You'll Hear This
"Each API endpoint is a serverless function — we don't manage any servers." / "Serverless functions scale to zero, so dev environments cost nothing when idle."
Related Terms
Cloud Function
A cloud function is a piece of code you deploy to the cloud that runs when triggered — by an HTTP request, a file upload, a timer, or another event.
Cold Start
A cold start is the delay you get when a serverless function hasn't been used for a while and the cloud needs to spin up a fresh container to run it.
FaaS (Function as a Service)
FaaS is when you write a tiny function and deploy it to the cloud, and it only runs (and charges you) when someone calls it.