Invoke Lambda functions

- [Instructor] The core components of an application built … on AWS Lambda are the Lambda function and the event source. … The Lambda function is the code that processes events. … For example, in the previous movie, … we wrote a code to stop running EC2 instances. … The event source is the AWS service, … or a custom application, that publishes events. … To understand this, think of a video hosting … and processing company. … Users user a mobile application … to create and upload these videos. … The application stores these in an Amazon S3 bucket. … Amazon S3 is a supported AWS event source … that can publish object-create events … and invoke your Lambda function. … The Lambda function can read the video object … from the S3 bucket, process it by applying … the necessary encoding, save it in another S3 bucket … used to host all processed videos, … and then share it with other users of the application. … AWS Lambda can also pull for events. … Think of a custom application … that writes records to SQS Queue. …