Which AWS service lets you run code in response to events without provisioning or managing servers?
A.Amazon EC2
EC2 gives you virtual servers to manage.
B.AWS Lambda
Correct. Lambda is event-driven serverless compute.
C.Amazon ECS
ECS runs containers — you still manage the container platform.
D.AWS Elastic Beanstalk
Beanstalk deploys apps onto provisioned EC2 infrastructure.
Why this answer
Lambda is the canonical serverless compute service: upload code, it runs in response to triggers (S3 events, API calls, schedules), billed per invocation — zero infrastructure management.
Correct answer: B · Last reviewed 2026-10-26
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