| Keyword | Definition |
|---|---|
| Compression ratio | The ratio of the size of the original data to the size of the compressed data, which is a measure of the effectiveness or the efficiency of a data compression algorithm or a data compression technique. |
| Data compression | The process of reducing the size of a data file or a data stream in order to save storage space, reduce transmission times, or improve performance. |
| Lossless compression | A type of data compression that preserves all of the information or the quality of the data, but achieves a lower compression ratio, and that is typically used for compressing text, binary, or executable data. |
| Lossy compression | A type of data compression that sacrifices some of the information or the quality of the data in order to achieve a higher compression ratio, and that is typically used for compressing audio, video, or image data. |
| Redundancy | The property of a data file or a data stream that contains repeating or correlated information, or that contains information that can be predicted or inferred from other information, without affecting the meaning or quality of the data |
