The sequence "4, 8, 12, 16, ..." is an example of an arithmetic sequence, where each number increases by a constant value. In this case, the common difference is 4, meaning that to get from one number to the next, you add 4. This pattern continues indefinitely, allowing for the generation of additional terms like 20, 24, and so on. Arithmetic sequences are commonly used in mathematics to illustrate linear relationships and can be applied in various fields, including finance and engineering.