Explain the difference between the `DOMContentLoaded` and `load` events in JavaScript and their implications for web page performance.

The `DOMContentLoaded` and `load` events in JavaScript represent different stages in the loading process of a web page. Understanding the distinction between them is crucial for optimizing web page performance and ensuring a smooth user experience. The `DOMContentLoaded` event is fired when the initial HTML document has been completely loaded and parsed. This means that the browser has finished reading and interpreting the HTML structure of the page, and the DOM (Document Object Model) tree is fully constructed. However, external resources such as stylesheets, images, and subframes may not have finished loading at this point. JavaScript code that relies on the DOM structure, such as manipulating elements or attaching event listeners, can safely execute when the `DOMContentLoaded` event is fired. On the other hand, the `load` event is fired when the entire page has finished loading, including all dependent resources such as stylesheets, images, scripts, and subframes. This event indicates that everything necessary for the user to interact with the page is available. JavaScript code that needs to wo....