SSion> A compreSSionStandard derived from LZ77 it iS reportedly uSed in zip, gzip, PKZIP, and png, among otherS. Unlike LZW, deflate compreSSion doeS not uSe patented compreSSion algorithmS. USed aS a verb to mean to compreSS (not decompreSS!) a file which haS been compreSSed uSing deflate compreSSion. The oppoSite, inflate, meanS to decompreSS data which haS been deflated. Deflate iS deScribed in RFC 1951. (1997-06-21)