Java 21 officially introduces virtual threads (Project Loom), making high-concurrency programming simpler than ever. What Are Virtual Threads Virtual threads are lightweight threads managed by the JVM, not the OS. You can create millions of them, while platform threads are limited to thousands.
Source: [Dev.to](https://dev.to/alan_529cf536b9cf0f88ec8c/java-21-virtual-threads-is-the-thread-pool-era-over-1002)