Which AWS service is classified as a compute service?

Amazon Elastic Compute Cloud (Amazon EC2) is classified as a compute service because it provides resizable compute capacity in the cloud. This service allows users to launch and manage virtual servers, known as instances, which can be used to run applications, host websites, and perform various computing tasks. EC2 is designed to offer a wide range of performance options, making it suitable for everything from small applications to large-scale enterprise solutions.

In contrast, the other services listed do not primarily provide compute resources. Amazon S3 is an object storage service for storing and retrieving data, Amazon Simple Queue Service (SQS) is a fully managed message queuing service for microservices and serverless applications, and Amazon RDS is a managed relational database service designed to simplify database management. These services support various aspects of application development and management but do not fall under the category of compute services like EC2 does.