SSE, or Server-Sent Events, is a technology that allows a server to send real-time updates to a web client over a single HTTP connection. This is useful for applications that require live data, such as news feeds or stock price updates. Unlike traditional methods, SSE maintains an open connection, enabling the server to push updates automatically without the client needing to request them repeatedly. SSE is built on standard web technologies, making it easy to implement in web applications. It uses a simple text-based format to transmit data, which can be easily parsed by JavaScript. This makes it a popular choice for developers looking to enhance user experience with live content.