Final answer:
In Cassandra, a 'Map' is the dictionary-like collection type that stores key-value pairs. It allows unique keys to reference corresponding values, and is different from other types such as 'Set', 'List', and 'Tuple'. It's crucial to choose the right collection type based on performance and data model considerations.
Step-by-step explanation:
The collection type in Cassandra that is a dictionary-like object is a Map. A Map is an associative array that contains keys and values, where each key is unique and is used to reference the corresponding value. The 'Map' type can be especially useful when you need to store pairs of related values, and you want to be able to look up one member of each pair (the value) by using the other member (the key). Other collection types in Cassandra include Set, which is an unordered collection of unique items, and List, which is an ordered sequence of items. Unlike 'Map' and 'Set', 'List' preserves the order of its elements, so you can have duplicate entries. Finally, a Tuple is a fixed-size sequence of elements which can contain duplicates and maintain order, but its structure is not dictionary-like. When choosing collection types, it's important to consider the implications on performance and readability of your data model.