When you connect to an open Wi-Fi network like one at a coffee shop or airport, the network is generally unencrypted — you can tell because you don't have to enter a passphrase when connecting. Your unencrypted network traffic is then clearly visible to everyone in range.

What happens if WiFi is not encrypted?

Even if the hotspot you're using isn't a spoof but is just simply unsecured, hackers nearby can eavesdrop on your connection to gather useful information from your activities. Data transmitted in an unencrypted form (i.e., as plain text) may be intercepted and read by hackers with the correct knowledge and equipment.

Is unencrypted WiFi safe?

Public Wi-Fi Isn't Secure

If the network isn't secure, and you log into an unencrypted site — or a site that uses encryption only on the sign-in page — other users on the network can see what you see and send. They could hijack your session and log in as you.