In Power BI, workspaces, apps, and deployment pipelines support different stages of managing and sharing reports:

Workspaces are collaborative areas where teams create, edit, and manage reports, dashboards, semantic models, and other Power BI content.

Apps are packaged collections of Power BI content that are published from a workspace for end users. They provide a controlled way to share reports without giving users access to edit the underlying workspace content.

Deployment pipelines help move Power BI content through different environments, typically Development → Test → Production. They make it easier to manage and deploy changes systematically.

In short: Workspace = build and collaborate, App = distribute to users, Deployment Pipeline = move content between environments.