TOSCA (Topology and Orchestration Specification for Cloud Applications) is a standard language and model-driven approach for describing and managing the lifecycle of cloud-based applications. It was developed by the Organization for the Advancement of Structured Information Standards (OASIS) and is widely used in the field of cloud computing.

TOSCA allows users to define complex cloud applications and their related infrastructure using a graphical modeling language. It provides a standardized way to represent the topology of a cloud application, including the components, their relationships, and their interactions. This topology can then be used to orchestrate the deployment, configuration, and management of the application across multiple cloud environments.
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