Permissions are rules which are associated with objects on a computer or network to files and folders accessibility. Permissions is work on when you can access an object and what you can do with it and that object have some authentication. For example you might have access to a document on a shared folder on a network. Even though you can read the document, you might not have permissions to make changes to it. System administrators and people with administrator accounts on computers can assign permissions to individual users or groups. Permissions are set rule which are safe the data from data hacker and unwanted users.