With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one
thread to modify a shared object while another thread is in the process of using or updating that object's value. This often causes dirty data and leads to significant errors.

Synchronization occurs when you want two threads to run, but they are somewhat dependent on each other.

A thread is a distinct flow of program logic that can be executed at the same time as other threads. This make it seem like two things are running simultaneously (kind of like how word spell checks as you type).

Occasionally you might need one thread to wait until another thread gets to the same point.

An example might be if you had a program, and a fancy user interface that required animation. You might pause the logic part of your program and wait until the animation finished before the threads continue on. This is synchronization.

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