Developer's description:

WinRAR is a powerful archive manager. It can backup your data and reduce the size of email attachments, decompress RAR, ZIP and other files downloaded from Internet and create new archives in RAR and ZIP file format.

WinRAR supports all popular compression formats (RAR, ZIP, CAB, ARJ, LZH, ACE, TAR, GZip, UUE, ISO, BZIP2, Z and 7-Zip).

WinRAR is ideal for multimedia files. WinRAR automatically recognizes and selects the best compression method. The special compression algorithm compresses multimedia files, executables and object libraries particularly well.

Benefits:

WinRAR provides complete support for RAR and ZIP archives and is able to unpack CAB, ARJ, LZH, TAR, GZ, ACE, UUE, BZ2, JAR, ISO, 7Z, XZ, Z archives.
WinRAR offers a graphic interactive interface utilizing mouse and menus as well as the command line interface.
When you purchase WinRAR license you are buying a license to the complete technology, no need to purchase add-ons to create self-extracting files, it's all included.
WinRAR is easier to use than many other archivers with the inclusion of a special "Wizard" mode which allows instant access to the basic archiving functions through a simple question and answer procedure. This avoids confusion in the early stages of use.
WinRAR offers you the benefit of industry strength archive encryption using AES (Advanced Encryption Standard) with a key of 256 bits.
WinRAR supports files and archives up to 8,589 billion gigabytes in size. The number of archived files is, for all practical purposes, unlimited.
WinRAR offers the ability to create self-extracting and multivolume archives.
Recovery record and recovery volumes allow to reconstruct even physically damaged archives.
WinRAR features are constantly being developed to keep WinRAR ahead of the pack.

2. Added extraction of multipart ZIP archives created by 7-Zip.
Such archives have .zip.001, .zip.002, ... file extensions.
You need to open .zip.001 file in WinRAR shell to browse
or unpack such archive. All parts must be stored in the same folder
before starting extraction.

3. Added extraction of files split to multiple parts with .001,
.002, ..., extensions. You can open .001 file as a usual archive
and then unpack its contents. WinRAR will combine all parts
and save them to extracted file. All parts must be stored
in the same folder before starting extraction.

"001" item is included to "Associate WinRAR with" list
in "Settings/Integration" dialog.

4. WinRAR file list allows to use mouse Back and Forward buttons
or Alt+Left and Alt+Right keyboard shortcuts to navigate
in recently visited folders.

5. Folder wildcards are allowed in RAR command line in file names to
archive. For example:

rar a backup c:backup2015**

will archive all '2015*' folders in c:backup. Use -r switch to search
for '2015*' also in c:backup subfolders.