JavaScript is primarily regarded as the foundation for web development, playing a crucial role alongside HTML and CSS. As a versatile programming language, JavaScript enables developers to create interactive and dynamic web applications, enhancing user engagement. Its adoption across frameworks and libraries, such as React and Angular, has further solidified its position in the web ecosystem. JavaScript's capability to execute code on the client-side minimizes server load and improves performance. By providing rich functionality and facilitating seamless user experiences, it remains integral to modern web development practices.