I considered including HTML in this poll.
I decided against doing so because although it's called "HyperText Markup Language," it's not really a programming language. (As is true of its sort-of-parent, SGML.)
Offhand story time (since we're doing that now): other than the canonical "hello, world" program to learn C (and compiling), literally the first real program I wrote in C was the one that served the most people and was supported for the longest time.
There was a MS-DOS program called DataEase that provided a fairly nice front end to various database management systems, as well as having its own databases. The only problem was that our native DE databases were getting so big that backing them up, or copying them to a different machine (which we needed to do as this was just at the start of the era of Local Area Networks) took literally overnight. It was getting in the way of doing business.
So I sat myself down with a copy of DataEase and some kind of hex editor and puzzled out exactly how they did database exports and imports. I then wrote a C program to move these files, rather than import them, and then write the appropriate descriptive values directly into DataEase so that the new database would be properly recognized. An operation that was taking over 12 hours could be completed in a couple of minutes.
That capability changed how we did business. Being able to get a lot of data almost instantly from where it was created to where it was needed -- something we take for granted today -- made everyone in my office more productive because it increased the speed at which valuable information could be obtained when needed. That a larval-stage C programmer could make that happen was a lesson I never forgot.
The right program, in the right place, at the right time, can make a real difference. Programming is awesome.