NCERT Class 12 Computer Science Computer Science: Chapter 7 — Understanding Data
This chapter, "Understanding Data," introduces the fundamental concept of data and its significance in decision-making across various fields. It explains that data, a collection of characters, numbers, and symbols, is crucial for analysis and policy formulation, as seen in examples like college admissions, government census, sports strategies, and banking. The chapter highlights that raw data often needs processing and analysis to derive meaningful information and insights, which computers facilitate efficiently. It also touches upon the vast generation of data due to the ICT revolution and provides examples of common data types, emphasizing data's role in revealing hidden patterns and enabling informed actions in sectors like meteorology and finance. The importance of data for human reliance and computer-aided analysis is underscored.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 12 |
| Subject | Computer Science |
| Book | Computer Science |
| Chapter | Chapter 7 — Understanding Data |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 559 |
Learning outcomes
- Understand the definition and importance of data.
- Recognize the role of data in decision-making.
- Differentiate between data and information.
- Appreciate the need for data processing and analysis.
- Identify various sources and types of data.
Vocabulary
| Word | Meaning |
|---|---|
| Data | A collection of characters, numbers, and other symbols that represents values of some situations or variables. |
| Datum | Singular form of data. |
| Census | A systematic collection and recording of data about a population. |
| Information | Processed data that provides context and meaning. |
| Knowledge base | A store of information consisting of facts, assumptions, and rules used by an AI system for decision making. |
| ICT | Information and Communication Technology. |
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Practice questions
- What is data? Answer: Data is a collection of characters, numbers, and other symbols that represents values of some situations or variables.
- Why is data important for decision making? Answer: Data is important because it provides the basis for analysis, revealing patterns and insights that help in making informed decisions.
- What is the singular form of 'data'? Answer: The singular form of 'data' is 'datum'.
- Give an example of how data is used in government policy. Answer: Governments use census data to plan and formulate policies by understanding population characteristics.
Practice MCQs
Q1. What is the primary purpose of collecting and analyzing data?
Explanation: Data analysis helps in identifying patterns and insights, which are crucial for making informed decisions.
Q2. Which term refers to the systematic collection and recording of population data?
Explanation: Census is the process governments use to systematically collect and record data about their population.
Q3. What is the singular form of the word 'data'?
Explanation: The singular form of 'data' is 'datum'.
Q4. The ICT revolution has led to:
Explanation: The widespread use of computers, mobile phones, and the internet has resulted in a rapid increase in the volume of data generated.
Q5. Which of the following is an example of data?
Explanation: A person's name and age are raw pieces of information that constitute data.
Frequently asked questions
What is the difference between data and information?
Data is raw, unorganized facts, figures, or symbols, while information is processed data that has context and meaning, making it useful for decision-making.
Why is data processing important?
Data processing is essential to transform raw data into meaningful information and insights, which are necessary for analysis and decision-making.
How does the ICT revolution impact data?
The ICT revolution, driven by computers and the internet, has led to the generation of vast amounts of data at an unprecedented pace.
Give examples of data used in everyday life.
Examples include personal details (name, age), transaction records from banking or shopping, images, videos, and documents.
What is a knowledge base in the context of AI?
A knowledge base is a repository of facts, assumptions, and rules that an AI system uses to make decisions.
Related resources
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Topics covered
NCERT Class 12 Computer Science — Computer Science — Chapter 7 — Understanding Data. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.