📚 1. Information Retrieval

Definition:
Information retrieval is the process of searching for and obtaining useful data or knowledge from the internet.

How it works:

• You enter a query (question or topic) into a search engine or website.
• The system scans millions of documents and web pages.
• It shows you the most relevant results based on your query.

Examples of information you can retrieve:

• Definitions and explanations (e.g., “What is photosynthesis?”)
• News articles and current events
• Educational videos and tutorials
• Research papers and e-books

Useful platforms:

• Wikipedia
• Khan Academy
• NCERT ePathshala
• YouTube (for educational content)

Why it matters:
It helps students complete assignments, prepare for exams, and explore topics beyond the textbook.

🔍 2. Locating Sites Using Search Engines

Definition:
Search engines are special websites that help users find other websites, documents, images, and videos based on keywords.

Popular search engines:

How search engines work:

• Web Crawling: Programs called “web crawlers” scan websites and collect data.
• Indexing: The collected data is organized and stored.
• Searching: When you type a query, the engine searches its index and shows the best matches.

Tips for better searching:

• Use specific keywords (e.g., “Class 9 science notes” instead of just “science”)
• Use quotation marks for exact phrases (e.g., “Newton’s laws of motion”)
• Use filters to narrow results by date, type, or location

Why it matters:
Search engines help students quickly locate reliable websites and resources for learning.

🧑‍💻 3. Finding People on the Net

Definition:
The internet allows users to find and connect with people across the world for communication, collaboration, or learning.

Ways to find people:

• Social Media Platforms: Facebook, Instagram, LinkedIn
• Email Directories: Contact pages on websites
• Messaging Apps: WhatsApp, Telegram
• Professional Networks: LinkedIn for teachers, mentors, and professionals

Use cases:

• Connecting with classmates or teachers
• Joining study groups or forums
• Contacting experts for guidance
• Following educators or scientists for updates

Safety Tips:

• Never share personal information with strangers
• Use privacy settings on social media
• Report suspicious behavior or messages

📝 Summary Table

Would you like this turned into a classroom presentation or worksheet? I can also add diagrams or quiz questions to make it more interactive!