Lossless compression is a method of data compression in which the original data can be perfectly reconstructed from the compressed data. This means that no data is lost during the compression process. Lossless compression algorithms work by identifying patterns or redundancies in the data and encoding them in a more efficient way. This type of compression is commonly used in applications where it is important to preserve the integrity of the original data, such as in medical imaging, scientific data analysis, and archival storage.