An unencrypted database is a data storage system where information is stored in plain, readable text rather than being scrambled or protected by encryption. This means that anyone who gains access to the database can view its contents without needing a special key or password. Unencrypted databases are vulnerable to data breaches, as sensitive information like personal details, financial records, or login credentials can be easily exposed to unauthorized users. Encrypting a database is a key security measure to protect data from cyber threats and unauthorized access.