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Define HCI Human-computer interaction is a concerned with the design, evaluation and implementation of interactive computing systems for human use in other meaning it is the study, planning, and design of what happens when you and a computer work together. HCI consists of three parts: the user, the computer itself, and the ways they work together. What are its uses and applications in today environment? * Communications-: Electronic mail, computer conferencing, telephone and voice messaging systems For example human user can exchange messages throgh email application,then computers respond by the inputs from the user when sending and receiveing mail and by doing this human user interact with computer. * Designing software, such as; CAD/CAM For example CAD is used for displaying and editing designs on the computer so the human user Input data such as creating ,editing new designs and viewing designs from different angles using keyboard, graphics pad or touch-screen monitors then the computer...

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