LiveCD
Live CD is an operating system that boots from removable media (CD, DVD, USB stick, etc.) and does not require installation on a hard disk for its operation, i.e. portable.
Pros
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The benefit of a Live CD is ease of movement. For example, to work on someone else's computer, you can use your Live CD, which allows you to quickly access the familiar operating system and not be afraid to harm someone else's operating system and other people's data while working.
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Live CD can be used on computers that do not have a hard drive and on computers that have a very small hard drive.
Minuses
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Slow performance
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No data saved after reload