Daemon threads are low-priority threads whose only job is to offer assistance to user threads. Since daemon threads are intended to serve user threads and are just required while user threads are running, they will not keep the JVM from leaving once all client strings have completed their execution. That's why infinite loops, which commonly exist in daemon threads, won't cause issues because any code, including the final blocks, will not be executed once all user threads have completed their execution.
Thus, daemon threads are not suggested for I/O undertakings.
The single objective of the daemon thread is that it gives services to the user thread for background helping jobs. When there is no availability of user thread, does the JVM keep running the thread? No, JVM stops the daemon thread when there is no user thread.
Various java daemon threads are operating automatically, e.g., gc, finalizer, etc.
The java.lang.Thread class gives two methods for java daemon thread.