Accumulation point

An accumulation point is like a really popular spot where a bunch of people hang out. Imagine that you have a lot of toys and you put them all in a room. Some toys might be very close to each other, while others are far apart. Now, imagine that you pick a toy and you put it somewhere in the room. If there are other toys that are very close to the toy you just added, then that spot is an accumulation point.

Let's say you have a bunch of numbers instead of toys. You make a list of all the numbers and look at how they are arranged. If you pick a random number and there are other numbers in the list that are very close, then that spot is an accumulation point.

So, an accumulation point is a spot where there are a lot of numbers or things that are very close together. It's like a popular hangout spot for numbers!