CSS Computer Science (Optional) — Paper-I, Section-A, Topic I (Introduction to Computing) — supplementary notes extracted from source textbook, Chapter 1.
Information Technology (IT) — Definition
Information technology (IT) is the use of computer systems to manage, process, protect, and exchange information
- IT includes not just computers but also communications networks and computer literacy (knowledge of how to use computer technology)
- Core tasks across all fields: gathering, allocating, controlling, and retrieving information
- Example application area given in the text: Electronic Health Record (EHR) and Hospital Information Technology (HIT) systems — illustrates IT's cross-domain reach beyond pure computing
Computer Literacy
A computer-literate person:
- Knows how to use a computer within their own field to work faster/easier
- Has knowledge of computing terminology
- Understands, in broad general terms, what a computer is and what its capabilities are
- Knows how to use the Internet and World Wide Web and can take advantage of their resources
- Can critically judge the information found online (not just consume it uncritically) — an often-overlooked but exam-relevant component of "literacy"
Definition of a Computer
- A computer is an electronic device that:
- Accepts data (raw facts) as input
- Processes or alters that data in some way
- Produces useful information as output
- Data vs Information — a foundational and frequently tested distinction: Data = raw, unprocessed facts; Information = data that has been processed into a useful, meaningful form
- A computer program is nothing but a set of instructions (smallest unit of execution) that are used to execute particular tasks to get particular results.
- A computer manipulates data by following step-by-step instructions called a program
- Memory: holds the program, data, and information temporarily while processing is happening
- Secondary storage: holds the program/data/information permanently for future use, after processing ends