What are SDKs in AWS primarily used for?

SDKs, or Software Development Kits, in AWS are primarily used for developing applications that interact with AWS services. This means they provide the necessary tools, libraries, and documentation to facilitate the integration of various AWS services directly within your applications. By using SDKs, developers can write code that communicates with AWS resources such as S3 for storage, Lambda for serverless functions, and DynamoDB for databases, among others. The SDKs handle many of the complexities involved in making API calls, thereby allowing developers to focus more on building their applications and less on the details of the underlying AWS infrastructure.

For example, an AWS SDK might allow a developer to easily upload files to S3 buckets or trigger Lambda functions based on specific events without having to manually handle the HTTP requests and responses. This abstraction simplifies the development process and helps ensure best practices are followed in terms of authentication and service management.

Other options speak to unrelated activities, such as physical infrastructure management or cost management, which are important but do not fall under the purpose of SDKs. The primary focus of SDKs is on the application-level interactions with AWS services.