Sequence

A sequence is an ordered set whose elements follow a pattern.

1,2,3,4,5,…

We can see that each number is one greater than the previous number.

Here is another: $\dfrac{1}{1}$ , $\dfrac{1}{2}$ , $\dfrac{1}{3}$ , $\dfrac{1}{4}$ , $\dfrac{1}{5}$ , …