WiFi technology swept the entire world when it was first invented. It still is one of the most important technologies ever invented. All this is fine but what most users forget is that an open WiFi connection is dangerous, as it gives free reigns to the hackers.
It becomes important to know this because your passwords are exposed to the malicious people who are bound to misuse it. h 25% of households in world use wireless connections and out of this population, 49% of WiFi networks are unsecured. Even the most WiFi hotspots like airport, hotels are not safe.
These are precisely the reasons behind the 1 million cyber crimes everyday.