National databases are organized collections of data that are maintained by a government or national authority. They serve various purposes, such as tracking public health information, managing census data, or maintaining records of criminal activity. These databases help ensure that accurate and up-to-date information is available for decision-making and policy development. These databases often include sensitive information, so they are designed with security measures to protect personal data. Examples of national databases include the National Vital Statistics System for birth and death records and the National Crime Information Center for criminal records.