Definition - What does MiFi mean?
MiFi is a personal device that facilitates wireless access by acting as a Wi-Fi hotspot. Typically, one MiFi can form a local ad hoc network by providing a connection to up to 10 other devices.
Techopedia explains MiFi
MiFi is a registered trademark of the Novatel company. IT professionals may use the MiFi term informally to refer to similar devices. Novatel and other companies offer a variety of wireless devices with different operating systems (OS) and other features for various carriers.
There are different subscription models or financial plans for these devices, including monthly fees and pay as you go (PAYG) usage.