How do you know when a sequence is arithmetic vs. geometric?

From my understanding
Arithmetic Sequence is when each new tear. Is produced by adding a constant to the value of the previous which is like 13,20,27,34 its all adding by 7
Geometric Sequence is when each term is multiplied by the common ratio to get the next term such as 16,64,256,1024 each term is multiplying by 4(common ratio) from the previous number