What feature of AWS Lambda allows you to execute code in response to events?

The feature of AWS Lambda that allows code execution in response to events is event-driven architecture. This architecture enables AWS Lambda to respond automatically to specific triggers or events, such as changes in data within an Amazon S3 bucket, updates to a database in Amazon DynamoDB, or messages arriving in an Amazon Simple Notification Service (SNS) topic. This capability allows developers to build applications that react in real-time to changes in their environment, promoting a highly scalable and responsive system without the need to provision or manage the underlying infrastructure.

This event-driven approach encapsulates the primary benefit of AWS Lambda, as it allows for the efficient execution of code only when necessary, leading to cost savings and resource optimization. Instead of constantly running servers, users can deploy code that activates solely based on specific events, making it a fluid and dynamic solution for modern application development.