title: Why does cURL use zlib?
body: <p>It is possible to compile Libcurl with OpenSSL, SSH2 and zlib support. I found out that OpenSSL is used as an alternative for SSL traffic as it's described on the <a href="http://curl.haxx.se/docs/faq.html" rel="noreferrer">FAQ</a>, and I can deduce what SSH2 does, but what exactly is zlib used for?</p>