Week 7 Muddiest Point

I'm pretty new to the tech side of computers. I've certainly used them for most of my life, but even the thought of learning something as simple as HTML is exciting and new to me. Given the speed with which computer-related technology evolves, I'm wondering if HTML is still widely used. If it's been around long enough that I'm finally learning how to use it, does that mean that something else (XML?) has taken over?