An alternating sequence is a sequence of numbers where the signs alternate between positive and negative.
Periodic Sequence: A periodic sequence is a sequence that repeats after a certain pattern called the period.
An arithmetic sequence is a type of numerical sequence in which the difference between any two consecutive terms is constant.
A geometric sequence is a type of numerical sequence in which each term after the first is found by multiplying the previous term by a fixed, non-zero number called the common ratio.