What is the DOM? Now that I've asked that pesky question, I will not ask anything more about the essential thing you need to manipulate as a front end engineer

What is the DOM? Now that I've asked that pesky question, I will not ask anything more about the essential thing you need to manipulate as a front end engineer, what I want to ask about is algorithms implemented in many libraries because for some reason everyone else asks these questions in interviews. There's a lot better questions you could potentially ask that are algorithmic but more relevant and more approachable than mathematical functions, like text manipulation, json manipulation.