A dictionary as a data source stores data in:

A dictionary as a data source stores data in:

• A. A data source that stores data in key-value pairs
• B. A data source that stores data in a table with rows and columns
• C. A data source that stores data as documents
• D. A data source that stores data as graphs

Answer: (A)

Dictionaries store data as key-value pairs, meaning each piece of data is stored alongside a unique key that you use to access its value. This arrangement makes lookups fast because the key acts as an index into the collection, typically implemented with a hash table so you can retrieve the value in near-constant time. Keys are unique within the dictionary, and in many languages they are immutable types like strings or numbers, while the values can be any data type. This differs from a table with rows and columns, which organizes data in a fixed schema suitable for relational queries. It also differs from a document store, where data is kept as nested documents with structures that can vary, and from a graph store, which models data as nodes connected by edges to represent relationships.

Dictionaries store data as key-value pairs, meaning each piece of data is stored alongside a unique key that you use to access its value. This arrangement makes lookups fast because the key acts as an index into the collection, typically implemented with a hash table so you can retrieve the value in near-constant time. Keys are unique within the dictionary, and in many languages they are immutable types like strings or numbers, while the values can be any data type.

This differs from a table with rows and columns, which organizes data in a fixed schema suitable for relational queries. It also differs from a document store, where data is kept as nested documents with structures that can vary, and from a graph store, which models data as nodes connected by edges to represent relationships.