The internet is a global network of computers that communicate through standardized protocols. To access it, you need a device, a connection method (broadband, WiFi, mobile data), and an Internet Service Provider (ISP). Understanding how you connect, connection types, and basic network security helps you troubleshoot issues and protect your information.
Check your own internet connection settings and identify your provider, connection type, and signal strength. Test your connection speed and learn what factors affect it.
The internet is a system of interconnected networks, and connecting to it always involves a chain of distinct steps. Your device (phone, laptop) connects to a local network — either by WiFi (wireless) or ethernet (wired cable). That local network connects through a router to a modem, which connects to your Internet Service Provider (ISP) — a company like Comcast, AT&T, or a local cable provider. Your ISP connects to the broader internet, a global web of routers and fiber-optic cables linking millions of networks worldwide. Understanding this chain matters because each link can fail independently, and knowing which link failed is the key to fixing it.
WiFi is specifically the technology for the wireless connection between your device and your local router — nothing more. Your router could be connected to an internet service, or it might not be. This is why your laptop can show "Connected to WiFi" while still having no internet access: your device reached the router successfully, but the router has no path to the internet. The internet is what lives beyond your router; WiFi is just the on-ramp to your local network.
Connection types vary in how they deliver your connection from the ISP to your home. Broadband is the general term for high-speed connections. Cable internet (most common in the US) sends data over coaxial TV cables — fast and widely available. Fiber uses light pulses through glass cables — the fastest and most reliable. DSL uses telephone lines — slower, often in rural areas. Mobile data (4G/5G) uses cell towers — convenient but shared bandwidth means it slows when towers are congested. Each has different speed limits and reliability characteristics. Your ISP plan specifies a maximum speed (e.g., 200 Mbps download), but actual speed depends on network congestion, distance to the ISP's equipment, and your hardware.
Network security is a layered problem, not a switch you can flip. A password on your WiFi network (using WPA2 or WPA3 encryption) prevents unauthorized devices from joining your network — this is the basic minimum. But it does not protect you from threats that operate at higher levels: malicious websites, phishing emails, or software you install. Password protection means "strangers on the street can't see your network traffic or use your bandwidth"; it does not mean your device is secure from everything. Think of it as locking the front door of your house — necessary, but not a substitute for locking your valuables or being careful about who you let in.
This is a foundational topic with no prerequisites.
No prerequisites — this is a starting point.