The document describes the key components of the MVC pattern: the Model represents data and logic to update the Controller when data changes, the View visualizes the data in the Model, and the Controller controls data flow into the Model and updates the View whenever the Model's data changes.

5.  Model – Represents an object carrying data. May have logic
to update controller if its data changes.
 View – View represents the visualization of the data that
model contains.
 Controller – Acts on Model and view by controlling data flow
into model object and updates view whenever the data
changes.