The numerous files that are compressed with RAR compression are known as RAR files or WinRAR Compressed Archive. Compared to the usual ZIP compression, RAR compression has a much higher compression ratio which is why RAR files are more preferred. RAR files are known to include proprietary compression algorithm and other compressors use this algorithm already such as the 7zip. This is the reason why a variety of programs can already be used to extract these files especially in a Windows environment. RAR compressors are also known for the creation of multi-volume archives. These are split into multiple files so that they can be transferred to multiple disks. These split file archives use the file extension R followed by the digit that corresponds the part of the split archive; for instance R00-R99 by which the standard version is simply .RAR. Since RAR file extension was developed by Eugene Roshal, it actually stands for "Roshal Archive”.