Dictionaries provide fast lookups, based on keys, to get values. With them, we use keys and values of any type, including int and string.

data dictionary is a set of database tables used to store information about a database's definition.

Data dictionary is a data structue to store or hold data in the form of key and related value.

Data dictionary is a file which consists of the basic definitions of a database. It contains the list of files that are available in the database, number of records in each file, and the information about the fields.orData dictionary is a repository to store all information. Meta data is data about data. Meta data is data that defines other data. Hence, the data dictionary can be metadata that describes some information about the database.

data dictionary contains a list of all files in the database, the number of records in each file, and the names and types of each field