This is close but incorrect. Most common Lempel-Ziv compressors (gzip/brotli/zstd) use some form of entropy encoding (Huffman/Arithmetic/ANS) but that is in ad

This is close but incorrect. Most common Lempel-Ziv compressors (gzip/brotli/zstd) use some form of entropy encoding (Huffman/Arithmetic/ANS) but that is in addition to lz algorithm (usually lz77) itself. You can have a Lempel-Ziv compressor that doesn't use entropy encoding, look at something like lz4. lz77 essentially works by copying parts of the recent window of decompressed data. e.g if a phrase of length 10 was used 100 characters ago we could encode 100,10 instead of the phrase itself. Most compressors use entropy encoding on those offset and length streams.