It is usually installed by default on most Unix and Linux systems. It also rides along with most MinGW-based toolkits like Git for Windows. If you do software development, there is a good chance you might have Perl installed and not even know it.

Some people like to make fun of it despite its wide-spread use and utility. Most of them probably know little to nothing about Perl and have not written or maintained any Perl code. There is a good chance that they are using Perl code without knowing it.