Production certificate is used to identify the concerned organization with the help of distribution provisioning profile. If you want to upload your application to Apple App Store, production certificate allows you to submit your application in App Store. With the help of distribution provisioning profile application is published in App Store or can be installed to limited devices and this can be done only by production certificates.
Below are the steps which will help you out in the creation of production certificate:-
Step 1:- Create CSR file (Keychain access -> Certificate Assistant -> Request a certificate from certificate authority)