What is the role of JavaScript in web development?

JavaScript plays a crucial role in web development primarily by adding interactivity and dynamic content to web pages. This programming language enables developers to create responsive and engaging user experiences. Through JavaScript, developers can manipulate the DOM (Document Object Model), which allows for real-time updates to the webpage without requiring a full reload.

For example, JavaScript can be used to create dynamic features such as form validations, interactive maps, animated graphics, and user-generated content updates. This adds a layer of functionality that enhances the usability and appeal of a website, making it more responsive to user actions and providing an overall interactive experience.

The other options address functions that are not the primary purpose of JavaScript in web development. While static content can be defined using HTML, database management is typically handled by server-side languages and frameworks, and document structure pertains to HTML's role in creating a well-organized web page. Therefore, JavaScript's main contribution is its ability to create a dynamic and interactive user interface, distinguishing it from other languages and technologies involved in web development.