The people today in the 21st century are dependent fully on computers and its hardware and software accessories for many of their daily routine works. The computer has become an integral part of today’s human beings. From typing to e mails to net banking to online shopping, almost everything is available in the computer at your click of the mouse.With the computer having a limited storage space for keeping data stored, it is very necessary to use this storage carefully. One of the most popular and easiest way to adjust data is the compression of data function. ZLIB1.DLL is one such software that gives the function of compressing and decompressing data.