SDK

A Software Development Kit (SDK) is a comprehensive package of tools, libraries, and documentation used to build applications for a specific platform or service.

The SDK is your essential developer toolkit: it bundles pre-built components (libraries, APIs, code samples) for rapid application development. It allows engineers to integrate complex functionalities—like push notifications or mobile payments—without writing everything from scratch, significantly accelerating time-to-market. For instance, the Android SDK provides the framework for accessing device-specific features (camera, GPS); Apple's Xcode includes the Integrated Development Environment (IDE) for macOS and iOS development; and the AWS SDK enables direct integration with over 200 cloud services (S3, EC2) using multiple languages (Python, Java). An SDK’s core value is simplification: it abstracts away low-level plumbing (authentication, error handling) so your team focuses on feature delivery.

https://aws.amazon.com/what-is/sdk/