Skype is an instant messaging app that provides online text message and video chat services. Users may transmit both text and video messages and may exchange digital documents such as images, text, and video. Skype allows video conference calls . Skype implements a freemium model. Much of the service is free, but Skype Credit or a subscription is required to call a landline or a mobile phone number. Skype allows users to communicate over the Internet by voice using a microphone , by video using a webcam , and by instant messaging . Skype-to-Skype calls to other users are free of charge, while calls to landline telephones and mobile phones are charged via a debit -based user account system called Skype Credit. Some network administrators have banned Skype on corporate, government, home, and education networks, citing such reasons as inappropriate usage of resources, excessive bandwidth usage and security concerns. It is vital to understand the proble
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