CSMA/CD – Carrier Sense Multiple Access / Collision Detection

CSMA/CD - Carrier Sense Multiple Access / Collision Detection Short for Carrier Sense Multiple Access / Collision Detection, a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously (called a collision). Standard Ethernet networks use CSMA/CD to physically monitor the traffic on the line at participating stations. If no transmission is taking place at the time, the particular station can transmit. If two stations attempt to transmit si...
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Lossy Definition

Lossy Definition Lossy file compression results in lost data and quality from the original version. Lossy compression is typically associated with image files, such as JPEGs, but can also be used for audio files, like MP3s or AAC files. The "lossyness" of an image file may show up as jagged edges or pixelated areas. In audio files, the lossyness may produce a watery sound or reduce the dynamic range of the audio. Because lossy compression removes data from the original file, the resultin...
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Lossless Definition

Lossless Definition Lossless compression reduces a file's size with no loss of quality. This seemingly magical method of reducing file sizes can be applied to both image and audio files. While JPEGs and MP3s use lossy compression, newer compression algorithms, such as JPEG 2000 and Apple Lossless compression, can be used to create lossless compressed files. Lossless compression basically rewrites the data of the original file in a more efficient way. However, because no quality is lost, ...
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Codec Definition

Codec Definition Codec is short for "coder-decoder." It is an algorithm used to encode data, such as an audio or video clip. The encoded data must be decoded when played back. A media codec is not equivalent to media compression, since it is possible to encode a file without compressing it. However, most codecs do compress the original data, reducing the size of the original file. This is important for multimedia files, since they often have large file sizes. Compressed files take up les...
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Virtual Reality Definition

Virtual Reality Definition While the word "virtual" is typically overused in the computer world, it is aptly placed in the phrase "virtual reality." According to the American Heritage Dictionary, virtual means "existing or resulting in essence or effect though not in actual fact, form, or name." It can also mean "created, simulated, or carried on by means of a computer or computer network." Therefore, virtual reality is best described as an illusion of reality created by a computer system. A...
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iCloud Definition

iCloud Definition iCloud is an online service provided by Apple. It provides an email account, online storage, and backup services. It also allows you to share data between devices, such as Macs, iPhones, and iPads. Below is a list of features included with iCloud: Mail – an email account that can be automatically configured on Apple devices and accessed via Apple's webmail interface; iCloud email addresses end with mac.com, me.com, or icloud.com. Contacts – your address book is stor...
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Yosemite Definition

Yosemite Definition Yosemite is the name of Apple's eleventh version of OS X, released on October 16, 2014. It follows Mavericks (OS X 10.9) and is also called OS X 10.10. While it is normal for each new version of OS X to include slight modifications to the user interface, Yosemite presented the most drastic change in several years. The interface includes many translucent elements, in which objects are semi-transparent. It includes a more "flat" design than earlier versions of OS X with new...
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Lion Definition

Lion Definition Lion is another name for Mac OS X 10.7, the eighth version of Apple's desktop operating system. It was released on July 20, 2011, almost two years after Mac OS X 10.6 Snow Leopard and preceded the release of Mac OS X 10.8 Mountain Lion. Lion was the first version of Mac OS X to be released on the Mac App Store and was not sold on a DVD like previous versions of the operating system. Mac OS X 10.7 Lion was one of the most substantial updates to Mac OS X and included more than ...
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Snow Leopard Definition

Snow Leopard Definition Snow Leopard is another name for Mac OS X 10.6, which was released on August 26, 2009. It followed Mac OS X 10.5 Leopard and preceded the release of Mac OS X 10.7 Lion. Unlike Leopard, Mac OS X Snow Leopard did not include hundreds of new features. Instead, the update was primarily designed to improve the performance and efficiency of Mac OS X. Snow Leopard was the first Mac operating system to require an Intel-based Mac, which means it cannot be used on older Macinto...
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El Capitan Definition

El Capitan Definition El Capitan is the 12th version of Apple OS X, also known as OS X 10.11. It was released on September 30, 2015 and succeeded OS X 10.10 Yosemite. It was followed by OS X 10.12 Sierra. OS X 10.11 was not a significant update to Apple's operating system, but it included a number of performance updates. It was the first version to include "Metal," a graphics technology developed by Apple that accelerates Core Animation and Core Graphics processing. Metal makes full use of t...
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