Patrolling in Dota 2, what is it?

Recently, I came across the term “patrolling” in Dota 2 and I can’t understand what it means and how it affects gameplay. I noticed that many players discuss it on forums, but I still can’t grasp the essence. This has caused me difficulties, as it seems like I’m missing an important aspect of the game. Please help me figure it out to improve my skills.