screencast
Definition:
A screencast is a video mimicking what appears on someone's computer screen. Screencasts are often used in computer training to provide step by step instructions to make it easy for noobies to learn new technologies.
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4G
4G stands for 4th Generation and represents a network standard for mobile phone communication. 4G is used to transmit advanced data services such as Internet and streaming video from mobile phones. 4G is considered the first standard to bring near (and in some cases better) broadband speed to the mobile phone, making a big jump from current and previous speeds available with 3G.