Q - R
Quarantine
It is a state where in your Anti-Virus Software stores your virus infected file somewhere in your hard drive wherein it cannot infect other computer files. It is also done, so that you may recover your file in case of data corruption or loss of data.
RAM
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Random Access Memory is a electrical dependent storage device. It stores processes temporarily which allows you to use different application software simultaneously. Each software you use, may be it an Operating System or an Application Software, it needs a certain amount of RAM to store its processes temporarily. If your computer is shut down or restarts, all data on the RAM will automatically be removed and will be reset to zero. RAM's capacity is measured in Bytes.
ReBoot
It is a state of computer system in which the unit restarts. It is also referred as warm boot. Your can reboot your unit intentionally but when your computer bug down, it sometimes restarts automatically. There is a reset button on your computer unit usually near the power switch which will forcefully restarts your computer. It is also required after installing the hardware drivers and some other application software to refresh the system.