It’s a For Loop.

Imagine you want something to repeat a certain number of times, or run while a certain variable is set to a specific number.

It starts by setting i = 0. Then it says “while i is less than 10, run.” Then it says “Every time you run, increment i by 1. So it sets i to 0, runs once, sets i to 1, runs again, sets i to 2, etc… And it does this until i is 10, at which point it will stop because i is no longer less than 10.

The actual code you want to run each time i is less than 10 would go below this function.

It’s a pretty basic way to tell a program “do this thing [x] times and then move on.” It’s like coding 101, which is why it’s funny that the person claimed they knew everything except for that part.