Answer
BlackBerry ID is a master key to BlackBerry products, sites, services, and applications, including BlackBerry Protect, BlackBerry World storefront and BlackBerry Messenger. BlackBerry ID enables users to log into any BlackBerry product that supports BlackBerry ID.
Setting up BlackBerry ID for BlackBerry 7
How to Remove Blackberry id from Z10 Without Password
What is a BBM account?
BlackBerry ID is a master key to BlackBerry products, sites, services, and applications, including BlackBerry Protect, BlackBerry World storefront and BlackBerry Messenger. BlackBerry ID enables users to log into any BlackBerry product that supports BlackBerry ID.