A geometric sequence is a sequence where a common ratio is multiplied to each consecutive term.

A geometric series is the sum of all the terms of a geometric sequence.

Example : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377

Examples : 1, 1/2, 1/3, 1/4, 1/5 1, 1/16, 1/33, 1/50, 1/67, 1/84 1, -1/3, -1/7, -1/11, -1/15

An arithmetic sequence is a sequence where a common difference is added to each consecutive term.

An arithmetic series is the sum of all the terms of an arithmetic sequence.