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Possible Duplicate:
iPhone development - what is the difference between a development and distribution provisioning?
What is the difference between development and distribution tab under certificate in iOS Provision Portal? Which one should be used and when? Is there any apple's strict criteria to choose them?
You use developer certificate for when you want to install the applications using XCode - mostly when developing.
Distribution certificates are required when you want to put an app on the App Store or when you want to send an AdHoc build to testers (which they can install themselves without using Xcode).