I have started the course on Android app development (video 1). After creating the first simple app, when trying to open a virtual device, I get the following message:

Cannot launch AVD in emulator.
emulator: ERROR: x86 emulation currently requires hardware acceleration!
Please ensure Intel HAXM is properly installed and usable.
CPU acceleration status: HAX kernel module is not installed!

I'm not sure what that is all about. Can you clarify it, please?