What's the difference between walking and hiking? Okay, so I'm bored and looking at the snow out my window and my thoughts drifted to this question.

I've read several definitions of each plus other bored peoples discussions on the difference but none have been all that logical. After many decades going out on jaunts(see how I
avoid the issue) the difference seems pretty vague. Some define a walk by location (urban versus wilderness) or terrain (level versus elevation changes) or length (short versus long). I still find that with each description there are grey areas where walks could be considered hikes or hikes as walks.

What are your thoughts ?