What is a pocket WiFi and how does it work?

A pocket WiFi is a portable wireless modem, also know as MiFi, mobile hotspot, internet dongle, that connects any Wi-Fi enabled device - smartphones, laptops, and tablets - to the internet through the mobile telephone network.
It works like a domestic Wi-Fi hotspot, generating a WIFi network with a radius of about 10-15 meters around you but… it fits in your pocket!

It requires no installation, cables, or software. Just turn on the pocket WiFi, enter the password indicated on the device the first time, and connect your personal devices immediately!