What service does Amazon Lambda provide?

Amazon Lambda provides a serverless computing service designed to allow developers to run code in response to events without the need to provision or manage servers. This service automatically scales the underlying infrastructure to accommodate incoming requests, meaning that developers can focus more on writing their application logic rather than worrying about server management or capacity planning.

When a specified event occurs, such as an upload to Amazon S3 or a new message in an Amazon SQS queue, Lambda can trigger the execution of the associated code. This model is highly efficient because you only pay for the compute time utilized during the execution of the code, rather than paying for unused server capacity.

The other options describe different AWS services: a managed relational database service pertains to Amazon RDS, a content delivery network solution refers to Amazon CloudFront, and data analytics processing is associated with services like Amazon Redshift or AWS Glue. These alternatives do not capture the unique functionality of Amazon Lambda as a serverless execution environment.