You recognize this:
This has been around since the 60s. The whole track becomes electrified and heads(light sources) can be moved along as you see fit. But its a tad boring, so out of the commercial arena emanated these alternatives.
Cable light is similar to track only a lot trendier, but it is difficult to install. You also need a ton of different parts to complete the installation without losing your mind.
My favorite...You can bend this 358 degrees, it is trendy and much simpler to install.