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Cloud providers offer one or more command-line interfaces to allow scripted/programmatic management of your cloud resources. The command-line interface is geared toward sysadmins who want to perform routine management tasks without having to log in and click around a web interface.

Command-line interfaces work by using the cloud provider's APIs. In simple terms, the API allows you to manage your cloud resources programmatically. In contrast to a web management interface, in which you're clicking and typing, an API endpoint is a web service that listens for specially structured requests. Cloud provider API endpoints are usually open to the Internet, encrypted using Transport Layer Security (TLS), and require some form of authentication.

Cloud providers offer software development kits (SDKs) for software developers who want to write applications that integrate with the cloud. SDKs take care of the details of communicating with the API endpoints so that developers can focus on writing their application.