- The process of reducing the volume of data by applying compression technique is called Compression.
- The reduced data is called compressed data.
Decompression
- The reverse process of reducing the original data from compressed data is called Decompression.
- The resulting data is called decompressed data.
Compression types
- Compression divided into two types lossy and lossless see below figure.
Compression Utilities
- There are normally used compression utilities Win RAR and Winzip.
WinRAR
- WinRAR is a trialware file archiver utility for Windows. It can create archives in RAR or ZIP file formats, and unpack numerous archive file formats. Itsupports lossless data compression.
- Below figure shows the how to compress the a folder using WinRAR software.
- Below figure shows the how to decompress the a folder using WinRAR software.
Winzip
- ZIP is an archive file format that supports lossless data compression. A .zip file may contain one or more files or directories that may have been compressed.
- The .zip file format permits a number of compression algorithms, though DEFLATE is the most common. Zip files are compressed to save space.
- Below figure shows the how to compress the a folder using Winzip software.
- Below figure shows the how to decompress the a folder using Winzip software.
Advantages of Compression
- Reduce file size.
- Provide security.
- Save disk space.
- Increase transfer speed at a given data rate.
- Allow real-time transfer at a given data rate.
Disadvantages of Compression
- Lose the the data.
- Lose the quality.
- Some times we can forgot the password we lose the data.
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