What is Difference between single value and simple value attribute?

A single value attribute refers to an attribute in a database or data model that can hold only one value for a given entity or record, such as a person's birth date. In contrast, a simple value attribute is a specific type of single value attribute that cannot be further divided into sub-parts; for instance, a person's age is a simple value because it represents a singular piece of information without components. Essentially, while all simple value attributes are single value attributes, not all single value attributes are necessarily simple, as some may contain composite values.