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.

Next up
I've really been enjoying Ryan Trahan's "50 states in 50 days" series, so I made this concept in #Blender for a virtual boardgame based on the series What do you think?
Game Jolt Colors is back!
Draw your OC (or favorite character) in the Game Jolt color palette and post them in the Art realm with the tag #GameJoltColors25.
At the end of the event, we'll pick a winner & add their design to the GJ Colors sticker pack!
Tested out the "Freeze Generator" #Blender plugin by Blenderesse on this chair I made... It works really well and looks super cool imo!
The game I made with my brother @Lit-Lore-Studios now has a game page!
Go check it out on his profile and follow for updates!
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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