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cocoacocoa 

Can some one explain Difference bwn Change sets /ANT /Eclipse?

D-CoderD-Coder
They all do metadata deployments -- none deploy data.

Change Sets are used to move configuration between related orgs. They give you a history of what was changed in an easy to see and use 'collection' (the Change Set).

The IDE and ant can be used to deploy configuration into any org, but there is no change control, and they rely on effectively sending local copies of the configuration files from the user's computer into Salesforce.

You would use the IDE to do development in sandboxes, and then use Change Sets to move into Production.

If this answers your query please mark this question as a solved so that it can be filtered out from unsolved questions.
cocoacocoa
IThanks for responding, In these 3, Can I deploy into production or any other sandbox with out Test classes? If yes. What are they?
 
D-CoderD-Coder
You can migrate without running tests in between sandboxes. For prodiction deployments you can opt selective test run or Run All. While moving to production, tests execution is mandatory.

If this answers your query please mark this question as a solved so that it can be filtered out from unsolved questions.
cocoacocoa
Thanks D-coder
If you have some other stuff regarding this. Please drop it here. 
D-CoderD-Coder
Check this FAQ :
https://help.salesforce.com/articleView?id=000003620&language=en_US&type=1
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Cocoa,

Please refer the below link for reference. Hope it will be helpful.

Thanks
Rahul Kumar