React Portals is an advanced concept in React that enables developers to render elements outside the main React hierarchy tree while maintaining the component's parent-child relationship. This is particularly useful for elements like modals, tooltips, or dropdowns that need to appear above other elements without being confined by parent components' overflow or styling limitations. By utilizing the createPortal method, developers can attach elements to a different DOM node, such as a dedicated portal root, allowing them to bypass issues like overflow: hidden and ensure that pop-up elements remain visible and functional. The tutorial further explores the integration of React Hooks with Portals, demonstrating how custom hooks can be developed to manage portal rendering efficiently, thus promoting cleaner and more maintainable code. While the complexity of using Portals may exceed that of straightforward CSS/HTML solutions, it provides a robust approach for dynamic and interactive user interface elements.