Java Platform, Standard Edition (Java SE) is a widely-used programming platform that provides the core functionality for developing and running Java applications. It includes essential libraries, tools, and a runtime environment, allowing developers to create desktop applications, server-side applications, and more. Java SE is known for its portability, meaning that applications written in Java can run on any device that has a compatible Java Virtual Machine (JVM). This feature makes it a popular choice for developers looking to build cross-platform applications that can operate on various operating systems without modification.