What is an HDMI splitter, and why would you want one?

For all the advancements in home AV technology, things can still get pretty complicated. In some ways they’re more complicated than ever — you need to know the difference between HDMI 2.2 and 2.1, for instance, and Apple AirPlay versus Google Cast. Things were often confusing in the 1990s, but at least there weren’t spec revisions for the component jacks on the back of your VCR.