So, 2 ohm stereo stable means that in stereo mode (two channels) it can play as low as 2 ohms. 4 ohm stable bridged means that when you bridge the amp (combine the channels, also called mono) it can only play to 4 ohms.
Definition: Wireless (or wi-fi) hotspots are essentially wireless access points providing network and/or Internet access to mobile devices like your laptop or smartphone, typically in public locations. Wi-Fi Hotspot Security-Before You Connect to a Wi-Fi Hotspot. 2  International Wireless Internet Service: Wi-Fi Internet Access On the Go. 3  Mobile Internet Access Comparison: 3G, Wi-Fi, & Other Internet on the Go Options. 4  Wireless Networking FAQs for Mobile Workers.
Mobile WiFi hotspot is basically similar to MiFi, though most of the time this is the user of WiFi through your mobile device's cellular data. In other words a mobile hotspot is a WiFi network that other devices can connect to the internet by 'connecting' to your mobile device and using cellular data to access the internet.