Computers rarely work in isolation. Networks allow computers to communicate with each other, share resources, and access the internet. Understanding basic networking concepts helps you make sense of how data moves, why some connections are faster than others, and what terms like bandwidth and latency mean in practice.
What a Network Is
A network is a group of devices connected so they can exchange data. The internet is the largest network — a global system of interconnected networks. A local area network (LAN) connects devices within a building or campus. A wide area network (WAN) connects devices across larger geographic distances.
Bandwidth
Bandwidth is the maximum amount of data that can be transmitted over a network connection in a given time, typically measured in megabits per second (Mbps) or gigabits per second (Gbps). Higher bandwidth means more data can flow simultaneously.
Bandwidth is often confused with speed. Bandwidth is capacity — how wide the pipe is. Actual throughput depends on bandwidth, network congestion, and other factors.
Latency
Latency is the time it takes for data to travel from one point to another, typically measured in milliseconds (ms). Low latency means fast response times. High latency means delays.
Latency matters differently depending on the task. Streaming a large file benefits most from high bandwidth. Real-time applications — video calls, online gaming, interactive databases — are more sensitive to latency than bandwidth.
A useful analogy: bandwidth is the width of a highway; latency is how long it takes to drive from one city to another. A wide highway can carry many cars, but the travel time depends on distance and speed limits, not just road width.
Local Networks
Devices on a local network communicate through switches and routers. A switch connects devices within the same network. A router connects different networks — including connecting a local network to the internet. Wi-Fi provides wireless connectivity within a local area; wired Ethernet connections are generally faster and more reliable.
Networks and Data Work
Network performance affects how quickly data can be transferred between systems. Moving large datasets between servers, accessing cloud storage, or running distributed database queries all depend on network bandwidth and latency. In cloud computing, the network connection between your location and the cloud provider affects the responsiveness of cloud-hosted applications.
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