"series" is referenced in the pages listed below.

This page explores the power series, which is one where the terms of a sequence being summed are power functions. Interactive calculus applet.
The alternating series test is used to test for convergence when the terms of the underlying sequence alternate. Interactive calculus applet.
A series is the sum of some set of terms of a sequence. For example, the sequence 2, 4, 6, 8, ... has partial sums of 2, 6, 12, 20, ... These partial sums are each a finite series. Interactive calculus applet.