A botnet is a group of computers that are controlled from a single source and run related software programs and scripts. While botnets can be used for distributed computing purposes, such as a scientific processing, the term usually refers to multiple computers that have been infected with malicious software.
In order to create a malicious botnet, a hacker must first compromise several computers. This might be done by exploiting a security hole through a Web browser, IRC chat program, or a computer's operating system. For example, if a user has turned ...
While this term originally referred to a clever or expert programmer, it is now more commonly used to refer to someone who can gain unauthorized access to other computers. A hacker can "hack" his or her way through the security levels of a computer system or network.
This can be as simple as figuring out somebody else's password or as complex as writing a custom program to break another computer's security software. Hackers are the reason software manufacturers release periodic "security ...
A denial of service attack is an effort to make one or more computer systems unavailable. It is typically targeted at web servers, but it can also be used on mail servers, name servers, and any other type of computer system.
Denial of service (DoS) attacks may be initiated from a single machine, but they typically use many computers to carry out an attack. Since most servers have firewalls and other security software installed, it is easy to lock out individual systems. Therefore, distributed denial of service (DDoS) ...
Stands for "Content Delivery Network." A CDN is a group of servers distributed in different locations. Small CDNs may be located within a single country, while large CDNs are spread across data centers around the world.
CDNs are used to provide content to users in different locations as quickly as possible. For example, a user in San Francisco may receive website content from a server in Los Angeles, while a user in England may receive the same content from a server in London. This is accomplished ...
Stands for "Moving Picture Experts Group." MPEG is an organization that develops standards for encoding digital audio and video. It works with the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) to ensure media compression standards are widely adopted and universally available.
The MPEG organization has produced a number of digital media standards since its inception in 1998. Examples include:
MPEG-1 – Audio/video standards designed for digital storage media (such as an MP3 file)MPEG-2 – Standards for digital television and DVD videoMPEG-4 – Multimedia standards for the computers, mobile devices, and the webMPEG-7 – ...
File compression is used to reduce the file size of one or more files. When a file or a group of files is compressed, the resulting "archive" often takes up 50% to 90% less disk space than the original file(s). Common types of file compression include Zip, Gzip, RAR, StuffIt, and 7z compression. Each one of these compression methods uses a unique algorithm to compress the data.
So how does a file compression utility actually compress data? While each compression algorithm is different, they all work in a similar fashion. ...
Compression, or "data compression," is used to reduce the size of one or more files. When a file is compressed, it takes up less disk space than an uncompressed version and can be transferred to other systems more quickly. Therefore, compression is often used to save disk space and reduce the time needed to transfer files over the Internet.
There are two primary types of data compression:
File CompressionMedia Compression
File compression can be used to compress all types of data into a compressed archive. These ...
A font is a collection of characters with a similar design. These characters include lowercase and uppercase letters, numbers, punctuation marks, and symbols.
Changing the font can alter the look and feel of a block of text. Some fonts are designed to be simple and easy to read, while others are designed to add a unique style to the text. For example, Arial has a simple, modern look, while Palatino has an older more traditional appearance.
Serif vs Sans-Serif Fonts
The two most basic categories of fonts are "serif" and ...
Short for "Bitmap." It can be pronounced as "bump," "B-M-P," or simply a "bitmap image." The BMP format is a commonly used raster graphic format for saving image files. It was introduced on the Windows platform, but is now recognized by many programs on both Macs and PCs.
The BMP format stores color data for each pixel in the image without any compression. For example, a 10x10 pixel BMP image will include color data for 100 pixels. This method of storing image information allows for crisp, ...