Lossless techniques refer to methods of data compression that allow the original data to be perfectly reconstructed from the compressed data. This means that no information is lost during the compression process, making it ideal for applications where data integrity is crucial, such as in text files, images, and audio files. Common lossless compression algorithms include ZIP, PNG for images, and FLAC for audio. These techniques work by identifying and eliminating redundancy within the data, allowing for smaller file sizes without sacrificing quality. Lossless compression is widely used in various fields, including software development and digital media.