JavaServer Pages (JSP) is a technology used for building dynamic, server-side web pages using Java. JSP allows developers to embed Java code directly within HTML, providing an easy way to create interactive and data-driven web applications. JSP files are similar to PHP or ASP.NET files, where HTML is combined with logic, but JSP uses Java as the backend programming language.

When a JSP page is requested by a user, the server converts the JSP code into a Servlet (a special Java class) that processes the request and dynamically generates the HTML response. The ability to embed Java logic within HTML pages enables the integration of server-side data, business logic, and web services into the webpage.

JSP also supports custom tags and works seamlessly with JavaBeans and Java EE components, allowing developers to build complex, enterprise-grade web applications. Common uses of JSP include e-commerce sites, content management systems (CMS), and any web application that requires interaction with a backend database or other services.

JSP technology is part of the Java EE platform, and it is often used in conjunction with Servlets and JSP tag libraries to create reusable web components. JSP is advantageous because of its integration with the Java ecosystem, making it suitable for high-performance, scalable, and secure web applications.