What is DevOps - Explained in Details

Unless you are living under the rock, you must have heard the term DevOps, and probably you did not know what it means, or you did not know how to explain it. And I thought about every time I had difficulties fixing, creating or managing something about the infrastructure or using any tools, but the most difficult thing I ever had was when someone asked me, what do I do, and I had to explain it to them.