ELI5: Explain Like I'm 5

Limit (mathematics)

A limit in math is a way of talking about what happens when a number gets close to a certain "target" number. You can think of it like this: imagine you are standing at the bottom of a hill and you want to get to the top, but you have to take it one step at a time. The limit is like the top of the hill - it's the number you're aiming for and how close you get to it each step you take. When you keep taking steps, if you can get as close as you want (without actually reaching it) then the number you are approaching is a "limit".