Multithreading is a Java feature that permits the execution of two or more sections of a program simultaneously to maximise CPU efficiency. In other words, it is the process of executing multiple threads at the same time. A thread is a component of such a program. Threads are hence lightweight processes within processes.Threads can be formed using two different mechanisms:Extending the Thread class - We'll make a class that extends the java.lang.Thread class. The run() method of the Thread class is overridden by this class. The run() procedure is where a thread starts its life. To begin thread execution, we construct an object of our new class and use the start() method. Start() calls the Thread object's run() function.Bringing the Runnable Interface into Practice - We make a new class that implements the java.lang.Runnable interface and override the run() method of this. After that, we create a Thread object and call its start() method.The advantages of multithreading are:Since threads use a shared memory space, it helps in saving memory.Threads are autonomous and many operations can be performed at the same time, which helps in saving time.Because threads are independent, an exception in one thread has no impact on other threads.