It’s a beautiful Saturday morning, and you’ve settled down on a park bench to sip a coffee and catch up on your favorite news sites, watch a few videos and do some quick online shopping while getting sun and fresh air. Rather than draining your allotted mobile data, you hop onto your city’s public WiFi service. It’s free, and run by the city, so it must be ok, right? The fact is, you can’t be certain the municipal network is secure or even real (see the next point) and set up to protect you from malicious people or entities spying on you while you’re connected. Turning on a VPN can help protect your device from anyone who tries to snoop on the sites you’re visiting or hijack your sensitive login information while you’re kicked back on that park bench any day of the week.

在一個美麗的星期六早晨。您坐在公園的長板凳上，一邊喝咖啡一邊看著您最愛的新聞網站、看影片、一邊享受陽光和新鮮空氣，一邊在網路上購物。為了不浪費寶貴的上網流量，您連上市政府提供的公眾 Wi-Fi 服務。既然免費，又是由政府經營的，應該沒問題，對吧？但其實無法確定城市網路是否安全、甚至您連到的是不是真的由市府營運的那個網路（參見下一點），並且在連線時能夠保護不受惡意的其他人監控。開啟 VPN 連線後，可幫助保護您每天在公園休息時，都不被任何人窺探您造訪過哪些網站，或是偷走敏感登入資訊。