For LIGHTNING components, there are two different programming models. The first is to build out Aura components using the Aura framework, and the second is to use the newer Lightning Web Components (LWC) framework.

• Aura Framework: Aura is a user interface framework for creating dynamic web apps for mobile and desktop devices, with a scalable long-lived lifecycle to allow the development of growth-oriented apps. It allows for the creation of partitioned multi-tier components that connect the CLIENT and server. Aura, which has been around since 2013, allows developers to create apps that are not dependent on Salesforce data, allowing for minimal disruption to day-to-day customers. Because programs don't have to be optimised for each device, Aura allows for more efficient development.
• Lightning Web Components Framework: Lightning Web Components is a W3C Web Components standard implementation. It supports the aspects of Web Components that work well in browsers and only adds what's required to work in all Salesforce-supported browsers. It is a COLLECTION of advanced LIGHTWEIGHT frameworks based on the most recent web standards. It's a reusable code-based document object model element. It's used to create sophisticated interfaces without the need for JS or the creation of a library. This functionality makes it simple to use and faster, saving developers a LOT of time and work on the web stack.