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Difference between Sandbox and Developer Edition

a)
Using the Sandbx  we can copy the configurations and/or data from live instance/Production instance directly to Sandbox.
But
In Developer edition we cannot copy anything  from production/salesforce.com instance. Every thing should be manually done by the user.

b)
If we purchase Unlimited Edition, then Sandboax is included in the cost  but If we purchase Enterprise,professional or Group editions then we have to seprately pay for Sandbox.
But
Developer edition is free of cost. Any one can start using developer edition free of cost

c) Reason why do we have Sandbox and Developer edition?
Sandbox is created so that we can have a instance which is exactly like production on which we can test and implement our changes and then move it production.
But
Developer Edition is more like development of integration and apps, specifically for the AppExchange and a great place to learn/test/train users in salesforce.com

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