Network
Also known as: computer network, LAN, WAN
Grade 3-5
View on concept mapA group of interconnected computing devices that can communicate and share resources with each other. Nearly all modern computing depends on networks — from email and streaming to cloud storage and online gaming.
Definition
A group of interconnected computing devices that can communicate and share resources with each other. Networks range from small local area networks (LANs) connecting devices in one building to wide area networks (WANs) spanning cities or countries, up to the global internet.
💡 Intuition
A network is like a postal system for computers — it connects them so they can send and receive information.
🎯 Core Idea
Networks enable communication and resource sharing. They range from local (LAN) to global (internet).
Example
🌟 Why It Matters
Nearly all modern computing depends on networks — from email and streaming to cloud storage and online gaming. Understanding networks explains how data travels, why connections can be slow, and how to troubleshoot connectivity issues.
💭 Hint When Stuck
When learning about networks, start with the simplest case: two computers connected by a cable. Then scale up: a LAN connects devices in one location, a WAN connects locations across a city or country, and the internet connects networks globally. Focus on how devices find each other (addresses) and how data travels (packets).
Formal View
Related Concepts
🚧 Common Stuck Point
The internet is a network of networks, not a single thing. No one entity owns or controls it all.
⚠️ Common Mistakes
- Confusing the internet (global infrastructure) with the World Wide Web (websites accessed via browsers)
- Assuming Wi-Fi and internet are the same—Wi-Fi is a local wireless connection that may or may not have internet access
- Thinking a network requires physical cables—wireless, satellite, and cellular connections also form networks
Frequently Asked Questions
What is Network in CS Thinking?
A group of interconnected computing devices that can communicate and share resources with each other. Networks range from small local area networks (LANs) connecting devices in one building to wide area networks (WANs) spanning cities or countries, up to the global internet.
When do you use Network?
When learning about networks, start with the simplest case: two computers connected by a cable. Then scale up: a LAN connects devices in one location, a WAN connects locations across a city or country, and the internet connects networks globally. Focus on how devices find each other (addresses) and how data travels (packets).
What do students usually get wrong about Network?
The internet is a network of networks, not a single thing. No one entity owns or controls it all.
Prerequisites
How Network Connects to Other Ideas
To understand network, you should first be comfortable with computing system. Once you have a solid grasp of network, you can move on to internet, packet and protocol.