Sequence

A sequence in mathematics is an ordered list, such as an ordered list of numbers. An example of a sequence is "2,4,6,8,10,..."

A sequence differs from a set in that the ordering of the objects (numbers) matters for a sequence, but not for a set.

A well-known sequence that demonstrates the importance of the order is the Fibonacci sequence, which proceeds thus: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... and so on, with each term being the sum of the two terms before it.