AWS Lambda is a serverless compute service that allows you to run code without provisioning or managing servers. It automatically scales and executes code only when needed, from a few requests per day to thousands per second. In contrast:

• AWS EC2 requires manual server provisioning and management
• AWS Config is a configuration management service
• AWS Opswork is a configuration management service for Chef and Puppet

AWS Lambda follows the serverless computing model where you only pay for the compute time you consume.