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AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers. You simply upload your code (a Node.js script, Python file, etc.), and Lambda executes it.
However, Lambda functions do not run continuously. They are Event-Driven, meaning they must be invoked by a Trigger.
You can configure an S3 bucket to trigger a Lambda function whenever a new object is uploaded. Use case: A user uploads a high-resolution profile picture to S3. S3 triggers Lambda, which automatically resizes the image into a thumbnail and saves it back to another bucket.
You can trigger Lambda via HTTP requests.
Use case: You build a REST API using API Gateway. When a user sends a GET /users request, API Gateway triggers your Lambda function, which queries a DynamoDB database and returns the JSON response to the user.
You can trigger Lambda on a scheduled cron-like timer. Use case: Every Monday at 8:00 AM, EventBridge triggers a Lambda function that generates a weekly sales report and emails it to the management team.
You can trigger Lambda whenever data in a DynamoDB table changes.
Use case: Whenever a new user signs up and their record is inserted into the Users table, the DynamoDB Stream triggers Lambda to send them a welcome email.
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