THE POLLS is among the top indicators on which way the US election will swing as the big voting day draws closer.
⚠️ Read our US election live blog for the very latest on the 2020 race to the White HouseDonald Trump and Joe Biden went head-to-head in the second and final presidential debateCredit: EPA
Who is leading in the national polls?
Biden has been holding a steady lead in the national polls.
But, his "leads are not insurmountable. Trump has improved his standing in both Pennsylvania and Wisconsin since September," says Fox News.
As of October 22, the 10-poll average shows just over half of Americans intend to back Biden with 51.2 per cent of the vote.
With just weeks to the November 3 Election Day, already millions of American voters in 15 states have cast early ballots, according to the U.S. Elections Project at the University of Florida.
However, although polls are a good guide to the popularity of a candidate it doesn't always translate into results.
Who is leading in the swing states?
At the moment, Joe Biden is leading in the battleground states, with several key regions set to vote Dem.
Polls suggest Mr Biden is ahead in Michigan, Pennsylvania, Florida, Arizona, North Carolina, Ohio and Wisconsin.
Because of the way the American voting system works, even if there is a clear victor, they could still lose in the electoral college - just like Hillary Clinton in 2016.
When Americans go to the polls they are voting for the electoral college in that state.
The job of the group of people elected is to choose the President and Vice President.
There are 538 electors in total and for Biden or Trump to win they need to win 270 or more votes.The US election is being held on November 3Credit: AFP - Getty
How do US election polls work?
Opinions are gauged by conducting a series of questions on the public.
So far this year, pollsters have put out more than 400 national Presidential general election polls, an average of about two per day.
This is mostly done via telephone with computer software generating numbers randomly.
Did the 2016 US election polls get it right?
The outcome of the 2016 presidential election surprised a lot of people – none more so than many political pollsters.
Most polls correctly predicted a popular vote victory for Hillary Clinton, but overestimated the size of her lead.
The result was that Trump's electoral college victory was a surprise to analysts.
Trump and Biden go head to head in the final debate before the 2020 Presidential election