Block bindings connect registered post meta to block attributes through the visual interface. Select a block, access the Attributes section, choose the attribute to bind, and select your registered meta field as the source.
The interface only shows compatible meta fields – string types for text attributes, number types for numeric attributes. The meta field must be registered as single for the interface to work properly.
Once bound, editing the block content directly updates the post meta field. Changes save to the database and appear on both frontend and backend. The binding creates a live connection between block content and metadata.
Remove bindings by unchecking the attribute connection in the sidebar. The underlying meta data persists independently – block bindings are just an interface for editing existing post meta fields.