Embedded input forms are a convenient way to edit linked content from other content areas directly in the main record. The editor selects a content area via “Add” buttons → a separate section with the input fields of the other content area appears in the input form. Content edited this way becomes a fixed part of the main record.
This lets you build pages as if from a construction kit: a text and image block, 10 gallery images, 1 quote and so on.