RAR archiver:

- RAR introduces an original compression algorithm. It provides high compression
  ratios on executable files, object libraries, large text files, etc.

- RAR provides functionality for creating a 'solid' archive, which can raise the
  compression ratio by 10% - 50% over more common methods, particularly when
  packing large numbers of small files.

- RAR offers the ability to create and change SFX archives using default and
  external SFX modules.

- RAR offers the ability to create a multi-volume archive as SFX.

- RAR offers a number of service functions, such as encrypting files, adding
  archive comments and repairing physically damaged archives.