GSM

Definition:

GSM stands for Global System for Mobile communications and represents a standard for mobile phone communication. Consumers with GSM mobile phones can often roam between different cellular providers or switch cellular services without having to purchase a new mobile phone.

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HDMI

HDMI stands for High Definition Multimedia Interface and is an interface commonly used to connect two high definition devices, such as a Blu-ray DVD player and a high definition television. HDMI transmits a digital signal and is convenient in that in carries both audio and video with one connection.