Arithmetic sequences differ by a common difference $d$ each term. Geometric sequences are similar, but differ by a common ratio $r$ each term instead, where the next term is the previous term multiplied by $r$.
A geometric sequence is defined by its first term $u_1$ and common ratio $r$. The general form of a geometric sequence is:
$$u_1, u_1r, u_1r^2, u_1r^3, ..., u_1r^{n-1}$$, u_1r^{n-1}$$
where $n$ is the position of the term in the sequence.
If we have a sequence 2, 6, 18, 54, ..., we can identify that:
The common ratio of a geometric sequence can be between 0 and 1, in which case the terms in the sequence decrease.
For example, the first five terms of a geometric series with $u_1 = 8$ and $r = \frac12$ would be $8, 4, 2, 1, \frac12$.
The common ratio can also be negative, in which case the terms alternate sign.
For example, the first five terms of a geometric series with $u_1 = 2$ and $r = -3$ would be $2, -6, 18, -54, 162$.
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