In computing, a schema is a formal representation of data, usually in the form of a database. It can also generally refer to any structured data, such as XML or JSON. A schema defines data structure by specifying the relationships between different pieces of information. For example, a database schema might specify that every customer must have a unique ID and that every order must be associated with a customer. By defining these relationships, a schema helps to ensure that data is stored consistently and logically. In addition, a schema can be used to validate data before it is stored or accessed, which helps prevent errors and inconsistencies.
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