It's a setting in the viewport shading options called "Cavity", as you can see in the video above.
It only shows in the viewport, not the render, but the reason I like to use it is because sometimes it's hard to see the edges of a mesh in the viewport with the default flat shading.
Keep in mind that if you have a lot of complex meshes in your scene, this can cause the viewport to lag.

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Next up
Here's a sneak peak screenshot from the game I made with my brother @Lit-Lore-Studios in three weeks! The game page will be made public on his profile soon, so make sure to follow him!
Today I taught my #Blender class how to set up lighting for product rendering, and although it doesn’t look too exciting I think the result was good
Happy #WIPWednesday! Are you working on a game? Making some art? Practicing a song? Something else? Tell us in the comments!
This week I taught my class how to make cool text effects in #Blender
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