What is a file compression?

file compression is a method used by computers to reduce the size of an electronic file or file group to the smallest possible size. ZIP files are a common example of file compression. Many computer program techniques are used to compress files, but the most common method is to replace repeated sequences by smaller sequences. Computers do this by cataloging the first instance and refer to it in the following cases. For example, in the sentences before this, the letters "compressed" appeared three times. The computer can compress them by their first instance cataloging and balancing all the following instances with "& stroke" - that is, reducing the number of letters or characters required and reducing the size of the file. During a large ensemble, such a replacement can save a lot of space. It should be noted that the user does not see it - the computer does all background work.

You want to watch shortened replacements, computer programs also create a dictionary for a compressed file. In the world of compressionThe file is a dictionary list of original phrases and their replacement. However, this dictionary is included in the file size, so it also takes up space to reduce the amount of compression space. For this reason, it is usually less effective to compress one small file than a large file or group.

programs that perform file compression work somewhat differently. These differences are mostly the result of something called an algorithm. The algorithm is a mathematical construct that searches for repetition files and inserts simple links. Programmers create compression algorithms and define patterns and replacements to be used for compression. Deviations may affect the efficiency of compression. For example, in the phrase "It was the best of times, it was thine more times," sequences "it was" and "hundred times" repeat. The programmer may decide to replace every whole phrase or maybe replace "her" individually and "timey "individually. These slight differences in algorithms are the reason why some file compression programs work better than others.

Some types of compressed files are self-fermentation, which means they open automatically when the user clicks on them-not the necessary external programs for their uncomprimation. To create these files, the original compression program must add additional code to a compressed file. For this reason, the self-extracting compressed file is often larger than the same file if it has been normally compressed. This is usually considered a good compromise for companies that publish programs to be installed on a home computer. By performing the self -service of the file, the home user allows the home to skip the step and increases the likelihood of the software installed. For not compressing files, they are not self -reduction, there are a number of third -party programs available on the Internet.