The art of conditional rendering is a technique used in web applications to selectively render a component out of a set of candidates based on some condition, such as user authentication status, user privilege, or application state. It can also be used to implement a wide range of core React UI concepts, such as client-side routing and lazy loading. Conditional rendering offers several benefits, including faster load times and improved user experience, by enabling developers to customize their UI based on the user's properties and access privileges. Additionally, it helps to gracefully handle client-side operations, such as data fetching and communication with the backend, and can be used to implement server-side routing in single-page React apps. However, conditional rendering is different from conditional routing, which navigates the user from one route to another based on conditions. While Next.js supports both conditional rendering and routing, Remix also offers similar features. When implementing conditional rendering, developers can use various methods, such as if-else statements or ternary operators, without impacting their app's DOM and performance. However, nesting components within each other is considered an anti-pattern due to the potential for creating unnecessary re-renders. Overall, conditional rendering is a powerful technique that can improve the performance and user experience of React apps, and developers should consider its benefits when building complex web applications.