AWS Lambda
A serverless compute service that runs code in response to events without managing servers.
AWS Lambda is a serverless compute service that runs code in response to triggers such as an API Gateway request, an S3 object upload, a DynamoDB stream, or an SNS notification. AWS manages the underlying infrastructure — provisioning, patching, and scaling — so you only write and deploy function code. Billing is based on the number of invocations and execution duration measured in milliseconds, so there is no charge while the function is idle. The key exam distinction is between Lambda and EC2: EC2 provides persistent virtual machines where you control the OS and pay for uptime regardless of load, while Lambda is stateless and ephemeral, suited for short bursts of work rather than long-running processes or persistent connections.
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