A ____ is a special machine made of hardware and software, and it can process data to give useful information. Inside it, the central ____ unit (CPU) works like the brain, while memory and storage help to keep data. In modern offices, automation is used to make work easier, because ____ for documents, tables, and e-mail saves much time. Such office ____ also needs hardware devices like printers and ____ to be effective. For complex problems, companies create ____ systems that collect human knowledge and give advice. These systems are important when managers must choose the best ____. Computer ____ allows people to draw images, build 3D models, and design animations for games or films. Sometimes, users enter a virtual environment, a digital space that looks like another world. In this virtual ____, a headset and controllers make the experience very real. Today, multimedia ____ sound, text, video, and pictures in one system, making communication rich. Still, safety ____ must be remembered, because electricity and machines can be dangerous. Finally, corrective ____ helps learners when they make mistakes, so they can repeat and understand again.

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