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What Is Freemium? — Wiki
Freemium is a pricing model that allows users to sign up for a free trial with option to upgrade to paid version, if they find the free trial useful.. The key to making freemium work is converting enough free users into paying customers to offset the cost of providing the free service.
What Is Temp Or Temporary Gmail? — Wiki
Temporary or Disposable Gmail is a service allow users to quickly generate an anonymous email address and use it to communicate in private. . The disposable Gmails can also be used for signing up on websites or online forums without giving out your real identity or contact information.