How do I install zlib on Debian 6?

I want to install zlib on Debian 6. For this, I think I would use apt-get install, but I don't know which package to use. The package zlib doesn't exist, and if I install zlibc (which sounds most appropriate), running zlib -version brings up the error command not found. (I used apt-file search zlib to find zlibc.)

Is there another package which contains zlib, and how do I find this package?

A zlib command does not exist:

$ dpkg -L zlib1g
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/zlib1g
/usr/share/doc/zlib1g/copyright
/usr/share/doc/zlib1g/changelog.Debian.gz
/usr/share/doc/zlib1g/changelog.gz
/usr/lib
/usr/lib/libz.so.1.2.3.3
/usr/lib/libz.so.1

It is a library.

If you are searching for anything use apt-cache search.

And if you need a command to compress use either gzip or zip.

sudo apt install zlib1g

Possibly

sudo apt install zlib1g-dev

as well.