What to know about early voting and mail-in ballots

The push to vote early has amounted to an unprecedented wave, with more than 80 million having voted early so far

The US election is under way across the country, and so far more than 80 million people have voted early, according to the University of Florida's election lab.

In numerous states, the push to vote before election day, whether by mail or in-person, has amounted to an unprecedented wave of early voting.