Data communication and OSI layer Model

✍️ Introduction: The Internet is the largest and most powerful network in the world. It connects millions of devices globally, enabling communication, data sharing, research, social interaction, and business. But what really is the internet? Let’s break it down in simple terms. --- 🌐 What is the Internet? The Internet is a global network of interconnected computers and servers that communicate using standardized protocols like TCP/IP. It allows users to: Access websites and online services Send emails and messages Stream videos, play games Use cloud storage Access real-time information Example: When you open Google.com, your device connects to Google’s server via the Internet, fetches the page, and displays it in seconds. --- 🎯 Key Features of the Internet: 1. Global Connectivity – Links the world together 2. Decentralized System – No single owner 3. Multimedia Access – Text, video, audio, images 4. Always Growing – Billions of websites 5. Supports Many Services – Web, email, file sh...

After this sessions you are able to understand these topics: What is OSI Model? What is 7 layers and its function? Real- life example (e.g, Post office or WhatsApp. Diagram. 🌐 What is OSI Model? (Open Sy stems Interconnection Model) The OSI Model (Open Systems Interconnection Model) is a theoretical framework developed by ISO (International Organization for Standardization) that helps us understand how data travels from one computer to another over a network . 🌐 OSI Model Using Trick: "Aaj Phir Se Test Nahi Dena Padega" “ To remember the 7 layers of the OSI model from  top to bottom (Layer 7 to 1) , use this simple Hindi sentence: Aaj Phir Se Test Nahi Dena Padega” Each word stands for one layer: Aaj → Application Layer This is the topmost layer. It allows the user to interact with network applications like Gmail, WhatsApp, or Google Chrome. Phir → Presentation Layer It formats the data, encrypts or compresses it so that the receiver can understand it prop...