an individual user account, with disk space, webmail access, and shell account access
a single user account for personal use whereas a corporate account is for multiple user accounts and allows for collaboration between workgroups
A personal account, in general, is an account for use by an individual for their own needs. It is a relative term to differentiate the said accounts from those accounts for corportate or business use. The term "personal account" may be used genericly for financial accounts at banks and for service accounts such as accounts with the phone company, or even for e-mail accounts.