Learn in the textbookData Compression Methods and Characteristics
DefinitionZIP is a file format that bundles several files into one and shrinks them with a method that brings them back exactly as they were (lossless compression, 可逆圧縮).
ExplanationRestoring compressed data to its original form is called decompression (伸長, also 展開). When you decompress a ZIP file, the files you bundled come back without losing a single bit. It works with any kind of content, from documents to programs, so people use it to send or store many files at once.
AnalogyIt is like packing a stack of papers into one envelope so it ships flat. Open the envelope and every sheet is still there.
Memory hookIn English, "zip" means to close a zipper. Picture gathering loose things into a bag and zipping it shut.