Salesforce JavaScript Developer Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

In Lightning Web Components (LWC), the correct keyword to denote public properties is `@api`. This decorator is used to expose properties and methods that can be accessed from the parent component. By applying the `@api` decorator, you make the component's properties publicly accessible, allowing other components to interact with them.

This functionality is essential in a component-based architecture, where encapsulation and modularity are critical. When a property or method is decorated with `@api`, other components can bind to these properties or call these methods, enabling a clear and interactive component hierarchy.

In contrast, the other choices do not represent the correct way to define public properties in LWC. The keyword `public` does not exist in the context of LWC, while `private` signifies that a property is meant for internal use only and cannot be accessed from outside the component. The term `@public` is also not a valid annotation in LWC, as the framework specifically uses `@api` for this purpose. Thus, understanding the role of `@api` in the context of component communication and accessibility is crucial for developing effective Lightning Web Components.