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A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program. -
It's any device or system that allows the transmition by coded signal over distance. -
It's a telecommunication device used to have a conversation between two o more people. -
Radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. -
It's a system of transmission of images and sounds used for entertainment. -
A tablet is a wireless, portable personal computer with a touchscreen interface. -
Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for conducting business, and in order to have access to a telephone in the event of an emergency.