Visualforce: Visualforce is a framework that allows developers to CREATE complex, creative user interfaces that run natively on the Lightning PLATFORM. The Visualforce framework provides a tag-based markup language, comparable to HTML, as well as a collection of server-side "common controllers" that make doing fundamental database operations like QUERIES and saves a breeze. Each Visualforce tag corresponds to a coarse or fine-grained user interface component, such as a segment of a PAGE, a related list, or a field, in the Visualforce markup language. Developers can attach their own logic with an Apex controller class to control the behaviour of Visualforce components, or they can utilise the same logic that is used in regular Salesforce pages to govern the behaviour of Visualforce components.

The majority of the work is done on the server with Visualforce components. Rather than using the concept of a page as its core unit, Lightning is built from the ground up. Client-side centricity makes Lightning Components more DYNAMIC and mobile friendly.