Java 25 introduces significant improvements as a Long-Term Support release, featuring 18 JEPs that enhance developer experience and runtime performance. Key additions include compact source files with simplified main methods, flexible constructor bodies allowing validation before super() calls, ahead-of-time compilation features for faster startup, scoped values as ThreadLocal alternatives, and module import declarations. The release focuses on reducing boilerplate code, improving memory efficiency, strengthening cryptography with PEM encoding support, and modernizing concurrency patterns for virtual threads.