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  1. [computing] The process of reducing the size of a file or database. Typically clarified as lossy (high compression/some data loss) or lossless (lower compression/larger file size). Compression improves data handling, storage, and database performance. Examples of compression methods include run-length encoding, and wavelets.
  2. [Esri software] A process that removes unreferenced rows from geodatabase system tables and user delta tables. Compression helps maintain versioned geodatabase performance.

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