What is Big Data?

• A. Data collected from various sources; web browsing and IoT can be analysed to reveal patterns or trends
• B. Data stored in a single database
• C. Only internal data
• D. Data that is always clean

Answer: (D)

Big Data means extremely large and diverse sets of data generated from many sources, often at high speed, that organizations analyze to uncover patterns, trends, and insights. It isn’t limited to internal data or to a single database; it includes data from web activity, IoT sensors, social media, transactional systems, open data, and more. The value comes from combining and analyzing this mix, which can be structured, semi-structured, or unstructured.

A key point is that data in Big Data projects is not usually pristine. It often comes with errors, gaps, duplicates, and varying formats, so cleaning, integration, and governance are essential steps before analysis. That’s why the idea that Big Data is always clean is incorrect.