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
Busy making this door in #Blender for my game "What Was Found at Ravenhill"
#HobbitDay My favourite thing about LOTR you ask? Um... all of it??
Here are some LOTR themed renders I made in #Blender a long time ago. They're not that good, so maybe I should make more now that I've had more practice
Your fellow Jolters are still hard at work making GREAT #GameJoltColors25 art!
There's still time for YOU to be part of it. Check your quest log to get started.
All artists are tagged below! 🔽
Another friend?
Joltober prompt day 4: #Potion For the Joltober prompt potion, I made what I think a #Minecraft brewing stand would look like in real life. What do you think?
And now he isn't so dirty anymore
#GJAsks What's your favorite game featuring zombies?
I don't usually like games or movies with zombies in them, but I did enjoy Half Life 2, mainly for Valve's amazing level design and storytelling
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