Which data type includes a decimal point?

The correct answer is decimal because this data type is specifically designed to represent numbers that contain a fractional component, which includes a decimal point. Decimals are commonly used in programming to handle situations that require precision, such as financial calculations, where rounding errors that can occur with integers would not be acceptable.

In contrast, the string data type is primarily used for text and does not inherently represent numeric values, including decimals. Integers, on the other hand, are whole numbers without any fractional part, and therefore do not include decimal points. An array is a collection type that can hold multiple values, but it does not inherently relate to the concept of numeric precision or decimal points.

Thus, decimal stands out distinctly as a type that is meant to store numbers with decimals, making it the appropriate choice in this context.