Looking for a way to run a small piece of code only when it’s needed — without managing servers? That’s exactly what serverless functions do.
🚀 What is Google Cloud Functions (Function-as-a-Service)?
Google Cloud Functions is a serverless “function-as-a-service” solution that lets you upload a snippet of code and have it executed only when triggered by an event or HTTP request — then shut down immediately after. This makes it ideal for small, independent tasks that don’t need a full-time server.
Think of it like a “just-in-time code runner”: when something happens (a file is uploaded, a database record changes, an HTTP call is made), GCF automatically spins up the function, runs your code, returns the result — then the instance is “spun down.”
Use this when you have a lightweight task that needs to react to external events — without the overhead of provisioning or managing servers manually.
Cloud Functions automatically executes your code in response to triggers such as HTTP(S) requests, Cloud Pub/Sub messages, Cloud Storage file uploads, and Cloud Firestore database changes. This makes it ideal for building microservices, on-demand APIs, automation tasks, and real-time data processing pipelines.
One use case can be converting PDF to Image. When a PDF gets uploaded to cloud storage, convert it to PNG and store it to some location to cloud storage.
Exam Tip: If you encounter a question about executing small, event-driven code—such as responding to a file upload, database update, Pub/Sub message, or HTTP request—always select Google Cloud Functions from the list of options.