What is keyword view and Expert view in QTP?

What is keyword view and Expert view in QTP?

QuickTest’s Keyword Driven approach, test automation experts
have full access to the underlying test and object properties, via an
integrated scripting and debugging environment that is round-trip
synchronized with the Keyword View.
Advanced testers can view and edit their tests in the Expert View,
which reveals the underlying industry-standard VBScript that
QuickTest Professional automatically generates. Any changes
made in the Expert View are automatically synchronized with the
Keyword View.