在eclipse的debug窗口,为什么tomcat要开这么多线程?

在eclipse的debug窗口,为什么tomcat要开这么多线程?
org.apache.catalina.startup.Bootstrap at localhost:4047
Thread [main] (Running)
Thread [ContainerBackgroundProcessor[StandardEngine[Catalina]]] (Running)
Thread [http-8080-Processor1] (Running)
Thread [http-8080-Processor2] (Running)
Thread [http-8080-Processor3] (Running)
Thread [http-8080-Processor4] (Running)
Thread [http-8080-Processor5] (Running)
Thread [http-8080-Processor6] (Running)
Thread [http-8080-Processor7] (Running)
Thread [http-8080-Processor8] (Running)
Thread [http-8080-Processor9] (Running)
Thread [http-8080-Processor10] (Running)
Thread [http-8080-Processor11] (Running)
Thread [http-8080-Processor12] (Running)
Thread [http-8080-Processor13] (Running)
Thread [http-8080-Processor14] (Running)
Thread [http-8080-Processor15] (Running)
Thread [http-8080-Processor16] (Running)
Thread [http-8080-Processor17] (Running)
Thread [http-8080-Processor18] (Running)
Thread [http-8080-Processor19] (Running)
Thread [http-8080-Processor20] (Running)
Thread [http-8080-Processor21] (Running)
Thread [http-8080-Processor22] (Running)
Thread [http-8080-Processor23] (Running)
Thread [http-8080-Processor24] (Running)
Thread [http-8080-Processor25] (Running)
Thread [http-8080-Monitor] (Running)
Thread [TP-Processor1] (Running)
Thread [TP-Processor2] (Running)
Thread [TP-Processor3] (Running)
Thread [TP-Processor4] (Running)
Thread [TP-Monitor] (Running)
2,Thread [http-8080-Processor25] (Running) 与 Thread [TP-Processor1] (Running),这两种线程有什么区别?