With respect to multithreading, Synchronization is a process of controlling the access of shared resources by the multiple threads in such a manner that only one thread can access a particular resource at a time. In non synchronized multithreaded application, it is possible for one thread to modify a shared object while another thread is in the process of using or updating the object's value. Synchronization prevents such type of data corruption which may otherwise lead to dirty reads and significant errors.

E.g. synchronizing a function:

public synchronized void Method1 () {

// method code.

}

E.g. synchronizing a block of code inside a function:

public Method2 (){

synchronized (this) {

// synchronized code here.

}

}