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
A bit late for May the 4th , but here's a model of R2D2 I made in #Blender for the revenge of the 5th!
After 7 long years, the wait is finally over. Chapters 1-4 of DELTARUNE are out now!
Celebrate the parallel story to Undertale by completing these quests.
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
The Button Effect – @Frycandle 's minimalist first-person puzzler inspired by The Witness, The Talos Principle and The Beginner's Guide, is coming to Steam!Â
Play the demo and wishlist the game now:Â https://bit.ly/thebuttoneffect
#GJAsks One of the coolest Easter Eggs I’ve found in a game are these two skeletons holding hands in Horizon Zero Dawn. I love little details like this that make you wonder what happened and build stories in your mind.
Final sneak peak of the #Blender animation I'm working on!
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