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Deepu sfdcDeepu sfdc 

why we create Custom profiles ? we can clone standard profiles n we can customize .. so what the basis we create custom profiles ?

Amit Chaudhary 8Amit Chaudhary 8
Standard Profiles
Every org includes standard profiles. In Professional, Enterprise, Unlimited, Performance, and Developer Editions, you can use standard profiles or create, edit, and delete custom profiles. In orgs where you can’t create custom profiles (such as Contact Manager and Group Editions), you can assign standard profiles to your users, but you can’t view or edit them.

Type of profile

What’s the difference between standard and custom profiles?
Standard profiles
are included with Salesforce.  Object-level and user permissions cannot be changed on these profiles.  Standard profiles cannot be deleted.

Custom profiles are created by an administrator and can be fully customized.  Custom profiles can be deleted.

When should I create custom profiles?
Generally speaking you’ll want to create custom profiles prior to assigning users to profiles.  As you have limited ability to change standard profiles, it is generally a best practice to assign all users (with the exception of the system administrator) to custom profiles.
If users are assigned a standard profile and you later need to change their permissions (e.g. add read access to a custom object), you’d have to create a custom profile and then migrate all of those users to the custom profile.

Clone Profiles

Let us know if this will help you