Final answer:
The claim that the relational data model is not popular in the 21st century is false. Relational databases are widely used across many industries for structured data storage and remain a cornerstone of IT education.
Step-by-step explanation:
The statement that "The relational data model is no longer popular in the 21st century" is false. The relational data model remains one of the most widely used database models in today's organizations and systems. Developed by E. F. Codd in 1970, this model organizes data into one or more tables (or "relations") of columns and rows, with a unique key identifying each row. In the 21st century, relational databases like MySQL, PostgreSQL, and Microsoft SQL Server are still prevalent in industries that require structured data storage and powerful query capabilities. They are employed in various applications including financial systems, e-commerce, healthcare, and more. Despite the rise of non-relational databases like NoSQL for particular use cases, such as big data and real-time web applications, relational databases continue to serve core business needs and remain a fundamental part of IT education.