What is the main role of the JavaScript interpreter in a web browser?

The primary function of the JavaScript interpreter in a web browser is to execute JavaScript code. JavaScript is a scripting language commonly used to create interactive effects within web pages. When a web page is loaded, the browser's JavaScript interpreter reads and executes the JavaScript code found in the page. This allows for dynamic content updates, form validation, animation effects, and various interactive features that enhance user experience.

The interpreter translates the JavaScript code into machine code that can be understood and processed by the computer, effectively enabling the browser to carry out the instructions contained in the JavaScript. The efficient execution of this code is crucial for the performance of web applications, particularly those that require real-time user interaction or data processing directly in the browser.