Big O notation

Big O notation is like a way of talking about how long something takes. It tells us the biggest amount of time something takes, even when there are a lot of little details to consider. Think of it like using a ruler to measure the height of a really tall tree. You don’t need to measure every single branch, you just need to find out how tall the tallest part is. That’s how Big O notation works. It helps us figure out what the biggest time it will take is, instead of having to consider all the small details.