Based on their intended use, mountain bikes and gravel bikes have very different strengths. However, they also have a few things in common.
What type of bike is best for commuting? - Merlin Cycles Blog
Gravel bike vs hybrid bike: understanding the differences
Does every mountain bike brand now have a gravel bike? - Escape Collective
What is gravel biking and why is it so popular in Colorado? – The Denver Post
The Most Badass Gravel Bikes for Riding Your Heart Out
OPEN U.P.(P.E.R.)
OBED Boundary Gravel Bike Shimano GRX 600 - OBED Bikes
Are gravel bikes lightweight mountain bikes
Gravel bike vs Cyclocross bike: What's the difference? - Laka