Explain the terms:(a) Database Constraints(b) Metadata

(a) Database Constraints: Database constraints are predefined rules and restrictions applied to a database or on the values of certain types of attributes to maintain the integrity, accuracy, and reliability of that data. They help to ensure that the database is free from unwanted anomalies like duplicate entries, spelling errors, and ensure consistency of data. There are several types of constraints, including primary key, foreign key, unique, check, and not null constraints.

(b) Metadata: Metadata is data about data. It provides information about other data. In other words, it's a description and context of the data. It's used to provide documentation for data products. In essence, metadata answers who, what, when, where, why, and how about every facet of the data that's being documented. For example, in a music file, the metadata could include the artist's name, the album, and the year it was released.