Why "Synchronization" meaning not coming into C# thread ?

Question

Hi,

 

I am a beginner to c#. I have confusion on "Synchronization" operation in C#.  If synchronize applied that means locking applied , only one thread allowed at a time right. But "synchronization" means, doing multiple tasks at a time in English. According to that meaning, c# should allow multiple thread at a time when synchronization concept is applied right? Please clarify me.

 

thanks a lot