Photoshop is a powerful program full of hundreds of functions, many of which seem to behave very similarly, but definitely have distinct purposes that make them more or less appropriate than related tools depending on the situation. This video examines one of the most common cases, vibrance vs. saturation, and how you should use each in your editing.
Coming to you from Jesus Ramirez of the Photoshop Training Channel, this tutorial will show you the differences between and nuances of vibrance and saturation adjustments in Photoshop. Fundamentally, both work to increase and decrease the intensity of colors in an image, but whereas saturation simply increases the intensity of all colors simultaneously, vibrance increases the intensity of muted colors more so than already saturated colors while also working to protect skin tones and prevent posterization (which occurs when colors are so maxed out that transitions are destroyed, creating the blocky, banded look). You can think of vibrance as a sort of smart saturation on the global level. Of course, if you want to get even more precise with your color control, you'll want to dive into HSL and selective color adjustments and start masking things out, but for quick global adjustments, it's good to know the difference.