See also: How to manage applications

In Juju, an application is a running abstraction of a charm in the Juju model. It is whatever software is defined by the charm. This could correspond to a traditional software package but it could also be less or more.

An application is always hosted within a model and consists of one or more units.

Interaction between applications is handled by integrations (before Juju v.3.0, relations).

The links for “charms”, “operators”, and “hooks” do not take the user to a different page.

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Thanks, @serdarvural80. Added the correct links now.