DDR Data Science Interview Practice Test

A database is an organized collection of structured data stored electronically, designed for easy access, management, and updates. It stores data according to a defined schema, enabling reliable search, filtering, and relationships between pieces of information, while enforcing rules that keep data accurate and consistent. This setup supports multiple users and efficient operations through indexing, transactions, and concurrent access, which a simple file or spreadsheet typically cannot provide. A programming language for data analysis is a tool for processing data, not a storage system. A collection of unstructured text files likewise lacks the standardized structure that makes databases fast and reliable for querying and managing data.