If you don't know what a computer term means, you can find the definition in our glossary http://www.pcselfhelp.net/glossary To overclock is to set a computer to perform faster than advertised. It is dangerous, it may kill your computer, but if done properly, it may bring a big performance boost. http://www.pcselfhelp.net/glossary/Overclock Output is, put simply, the stuff you see. What's on your monitor is output. http://www.pcselfhelp.net/glossary/Output Outlook is a component of the Microsoft Office Suite that provides Email, organizational, and other functionality. http://www.pcselfhelp.net/glossary/Outlook OSI is an abbreviation of Open-Source Initiative. It is a non-profit that manages and promotes open source projects. http://www.pcselfhelp.net/glossary/OSI OSD is an abbreviation of Open Source Definition. It is an agreement for distributing, using, and modifying open source code. http://www.pcselfhelp.net/glossary/OSD Oscillation is the motion of swinging back and forth. http://www.pcselfhelp.net/glossary/Oscillation OS is an abbreviation for operating system, the underlying software that allows you to interact with your computer. http://www.pcselfhelp.net/glossary/OS An optical disc is a disc that is read by using light. CDs and DVDs are types of optical discs. http://www.pcselfhelp.net/glossary/Optical-disc OpenOffice is a free, open-source office suite that provides word processing, spreadsheet, presentations, and other functionality. http://www.pcselfhelp.net/glossary/OpenOffice Opera is a web browser that is often ahead of the curve on the features side and supports all of the major web standards. http://www.pcselfhelp.net/glossary/Opera