Plug the cable into your network port and your router
An ethernet cable is a physical wire that connects your computer directly to your internet router or modem. One end plugs into the ethernet port on your PC — a rectangular socket about the size of a phone jack, usually on the back of your tower or the side of a laptop. The other end plugs into an available port on your router, the box that broadcasts your internet signal.
The connection is straightforward: push the cable into the port until you hear or feel a small click. The connector has a plastic tab that locks into place. If the cable does not click, it is not fully seated and your internet will not work. Pull it out and try again, making sure the connector is straight and level with the port.
Most modern ethernet cables are Cat5e or Cat6 — the category number refers to the cable's speed capacity. Either works fine for home internet. The cable itself is the same on both ends, so it does not matter which direction you plug it in.
Key Takeaways
- The ethernet port on your PC is a rectangular socket, usually on the back of a desktop tower or the side of a laptop, and looks similar to a phone jack but slightly larger.
- Push the cable into both the PC port and an available port on your router until you feel a click, which means the connector is locked in place.
- Your PC should recognize the connection within a few seconds and show a wired network icon in your system tray or network settings.
- If your internet does not work after connecting, restart your router by unplugging it for 30 seconds, then plug it back in and wait two minutes for it to fully restart.
Locate the ethernet port on your computer
On a desktop PC, the ethernet port is almost always on the back of the tower, near the other ports (USB, audio, power). Look for a rectangular socket with a small plastic tab on the bottom. It is usually grouped with other network or audio connectors. If your desktop has multiple ethernet ports, any one will work — they are all connected to the same network.
On a laptop, the ethernet port may be on the side or back edge. Older laptops often have a dedicated port; newer thin laptops sometimes do not have one built in. If your laptop has no ethernet port, you will need a USB ethernet adapter — a small device that plugs into a USB port and has an ethernet socket on the other end. These cost $15 to $30 and work the same way as a built-in port.
Some gaming or workstation laptops have the port labeled with a small network icon (usually two connected computers or a globe symbol). If you are unsure which socket is the ethernet port, check your computer's manual or search the model number plus "ethernet port" online.
Connect the other end to your router
Your router is the device that receives internet from your modem and broadcasts it wirelessly and through ethernet ports. It usually sits on a shelf, in a closet, or mounted on a wall. Look for a box with several ports on the back — some labeled WAN or Internet (usually a different color, often yellow or blue), and several labeled LAN or Ethernet (usually the same color, often yellow).
Plug your cable into any of the LAN ports, not the WAN port. The WAN port connects to your modem; the LAN ports connect to your devices. If all the LAN ports are full, you can unplug a device you are not using and use that port instead. The order does not matter — each LAN port works the same way.
Push the cable in until it clicks, just as you did on your PC. You should see a small light on the router turn on or change color near that port, usually within a few seconds. This light indicates the connection is active.
Check that your PC recognizes the connection
Once both ends are plugged in and clicked into place, your PC should detect the wired network within 5 to 10 seconds. On Windows, look at the bottom right corner of your screen in the system tray. You should see a network icon — it may look like a computer monitor, a globe, or connected dots. Click it to open the network menu and confirm it shows "Ethernet" or "Connected" rather than "No internet" or "Disconnected."
On Mac, click the network icon in the top right corner of the menu bar. It should show "Ethernet" with a green dot next to it, indicating an active connection. If it shows a yellow or red dot, the cable is plugged in but not communicating with the router.
Open a web browser and try to load a website. If the page loads, your connection is working. If it does not, move to the troubleshooting section below.
Restart your router if the internet does not work
If your PC recognizes the ethernet connection but you have no internet, the problem is usually with your router or modem, not the cable or your computer. Unplug your router from the power outlet and wait 30 seconds. Then plug it back in and wait 2 to 3 minutes for it to fully restart — you will see the lights on the front cycle through different patterns as it boots up.
Once the lights settle into a steady pattern (usually a solid light on the WAN or Internet port), try loading a website again. This restart clears the router's memory and often restores internet when nothing else is wrong.
If you still have no internet after the restart, check that the cable from your modem to your router is also plugged in and clicked into place. The modem is the device that connects to your internet service provider's line (cable, fiber, or phone line). If that connection is loose, your router has no internet to share, even though it is powered on.
Understand when to use ethernet instead of Wi-Fi
Ethernet is faster and more stable than Wi-Fi because the cable carries the signal directly from your router to your PC with no interference. Use ethernet if you are downloading large files, streaming video in high quality, playing online games, or doing video calls. These activities benefit from the lower latency (delay) and higher speed that ethernet provides.
Wi-Fi is more convenient because you do not need a cable, but it is slower and can drop out if you move too far from the router or if other devices are using the network heavily. If your PC is in the same room as your router or close by, ethernet is the better choice. If your PC is far from the router or you move it often, Wi-Fi is more practical, even though it is not as fast.
You can use both at the same time — your PC will prioritize ethernet and use Wi-Fi as a backup if the ethernet cable is unplugged. This is useful if you want to keep the ethernet connection active but also have Wi-Fi available when you unplug the cable to move your laptop.
Frequently Asked Questions
What if my PC does not have an ethernet port?
You can buy a USB ethernet adapter for $15 to $30. Plug it into any USB port on your PC, then plug your ethernet cable into the adapter. Windows and Mac both recognize these adapters automatically — no software installation needed. Some adapters are USB-A (the standard rectangular plug), and some are USB-C; check your PC's ports before you buy.
Can I use any ethernet cable, or do I need a specific type?
Cat5e and Cat6 cables both work for home internet. Cat6 is slightly faster and handles longer distances better, but for most homes the difference is not noticeable. Avoid very old Cat5 cables if possible, but if that is what you have, it will still work. The cable length does not matter as long as it reaches from your PC to your router — 25 feet is common and works fine.
Is it bad to leave the ethernet cable plugged in all the time?
No. Ethernet cables are designed to stay plugged in permanently. Leaving it connected does not damage your PC, router, or cable. If you want to unplug it, just pull straight out — you may need to press the small tab on the connector to release it.
Why is my ethernet connection slower than my Wi-Fi?
This is usually a sign that your ethernet cable is damaged or your router port is failing. Try a different cable or a different port on the router. If the speed improves, the original cable or port was the problem. If the speed stays the same, your internet service itself may be slower than advertised — contact your provider to check.
Do I need to restart my PC after plugging in the ethernet cable?
No. Modern PCs detect ethernet connections when ready and do not need a restart. If your internet does not work within 10 seconds of plugging in the cable, restart your router instead, not your PC.