What is HCI? HCI stand for Human computer interaction. HCI is the study of the interaction between human and computers. HCI is arose as a field from intertwined roots in computer graphics, operating systems, human factors, ergonomics, industrial engineering, cognitive psychology, and the systems part of computer science.
Interaction between human and computers occurs at user interface, includes software and hardware. For example, hand phone, laptop, mouse and others.
Interaction Design, nowadays everything also designed either good or bad. According from Wikepedia, Interaction design is the practice of designing interactive digital products, environment, system, services and others.
For another example, as a designer we used software of Adobe illustrator, Photoshop, Flash and others. These are all actually interacting with computer.
source : http://en.wikipedia.org/wiki/Human%E2%80%93computer_interaction
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