In a Lightning Web Component (LWC), there are three main files that work together to define the component's structure, behavior, and styling:

HTML (HyperText Markup Language):

Purpose: The HTML file defines the structure and markup of the component. It includes the elements and tags that determine how the component's content is displayed.

Usage: HTML is used to create the visual layout of the component, including the arrangement of buttons, forms, text, and other user interface elements.

Example (exampleComponent.html):

JavaScript:

Purpose: The JavaScript file contains the logic and functionality of the component. It handles events, manages data, and interacts with the DOM (Document Object Model) to control the behavior of the component.

Usage: JavaScript is essential for handling user interactions, making server requests, and performing other dynamic actions within the component.

Example (exampleComponent.js):


CSS (Cascading Style Sheets):

Purpose: The CSS file defines the styling and appearance of the component. It includes rules for colors, fonts, spacing, and other visual aspects to ensure a consistent and appealing look.

Usage: CSS is used to enhance the visual presentation of the component, providing styles that control the layout and appearance.

Example (exampleComponent.css):


These three files work together to create a modular and maintainable structure for Lightning Web Components. The HTML defines the layout, JavaScript handles the functionality, and CSS takes care of the styling. This separation of concerns follows the best practices of component-based development, making it easier to understand, develop, and maintain LWCs.