The account is personal and associated with a specific natural person, regardless of the companies or professionals they work for. Each natural person can have only one account. Each account is identified by a username and a password.
The profile, on the other hand, represents the company or professional you work for. The same profile can be shared among multiple users thanks to the Corporate optional service. An account can have access to more than one profile if it operates on behalf of multiple entities. All the buying and selling actions carried out on the site are in fact to be considered as carried out by the entity represented by the profile.