How do you access AWS services programmatically?

Accessing AWS services programmatically is primarily accomplished through AWS SDKs (Software Development Kits) or the AWS Command Line Interface (CLI). The AWS SDKs allow developers to write code in various programming languages to interact with AWS services, enabling them to automate tasks, manage resources, or build applications that utilize AWS infrastructure. The AWS CLI is a unified tool that provides a consistent interface for managing AWS services through command-line inputs, making it easier for users to execute scripts or manage resources without relying on the graphical interface.

The other options, while relevant to AWS, do not facilitate programmatic access in the same way. The AWS Management Console offers a web-based graphical interface for users to manually interact with AWS services, but it does not enable programmatic control. AWS Marketplace is an online store for purchasing software and services but is not a method for accessing AWS services. AWS CloudFormation stacks allow users to define and provision AWS resources using infrastructure as code, but this operation also does not represent direct programmatic access to AWS services themselves. Therefore, the best answer is through the AWS SDKs or AWS CLI, as they are specifically designed for programmatic interactions.