Digital mobile Radio works on a digital stream that works over the internet between DMR enabled repeaters.
Getting Started with DMR:
You’ll need to already be a licensed ham operator of Technician class or greater.
To use DMR, you need to to have your call sign validated and get a Radio ID.
Get your DMR Radio ID: https://www.radioid.net/register
Amateur Radio Guide to DMR by W2XAB (PDF Download) : https://dmr-marc.net/media/Amateur_Radio_Guide_to_DMR_Rev_I_20150510.pdf
You can also use your PC as a DMR Transceiver: