Final answer:
Collection type constructors are features in programming that allow storage of multiple values. They include arrays, lists, sets, and dictionaries, used with functions like map, filter, and reduce for operations on groups of items.
Step-by-step explanation:
The term collection (or multivalued) type constructor refers to a feature in some programming languages and data modeling contexts that allows a variable or data structure to hold multiple values at once. This can include types such as arrays, lists, sets, or dictionaries, depending on the language. These constructors are crucial for cases where a single value cannot adequately represent a piece of information, such as a list of phone numbers associated with a contact in an address book or a collection of items in a shopping cart.
Functions like map, filter, and reduce are often used in combination with collection types to iterate over items, apply operations to each item, or accumulate values from a sequence, respectively. This enables the creation of sophisticated data structures and algorithms that operate on groups of items rather than individual elements.