Which directive is used for conditional rendering in LWC?

The use of "if:true" and "if:false" in Lightning Web Components (LWC) is specifically designed for conditional rendering of elements in the markup. These directives allow developers to control whether a certain part of the template is rendered based on a boolean value.

When "if:true" is applied to an element, that element will only be displayed if the expression evaluates to true. Conversely, "if:false" will ensure that the element is rendered only when the expression evaluates to false. This provides a clear and straightforward way to manage the visibility of components in the user interface based on the underlying data or application state.

This method enhances the dynamic capabilities of LWC, making user interfaces more interactive and responsive to changes in data. By using these directives, developers can conditionally render components without needing to manipulate the DOM manually or write complex JavaScript logic to manage visibility.

Other options do not represent valid directives in LWC for rendering elements conditionally. For instance, terms like "if-then" and "when-true" do not exist in the framework, and "if-else" cannot be directly used in LWC rendering logic, which is why they are not suitable for this question.