These teams are the two teams with the best record in each conference that did not win their division, and they play each other in the first round.
In the NFL, there are four wildcard teams in each conference. These teams are the two teams with the best record in each conference that did not win their division, and they play each other in the first round. The wildcard round is a single-elimination tournament, so the winner of each game advances to the divisional round, where they will face one of the three division winners from their own conference.
The four wildcard teams are seeded based on their regular season records, with the seedings rotating annually between conferences. In odd-numbered years (like 2019), it goes: #5 vs. #4 and #6 vs. #3; and in even-numbered years (like 2020), it goes: #6 vs. #3 and #5 vs. #4. The higher seed always hosts each game.
So for example, let’s say that this year’s NFC playoff field looks like this:
1) 49ers 2) Packers
3) Saints 4) Cowboys 5) Seahawks 6) Eagles
If it plays out like that, then we would have a matchup of (#5 Seahawks at #4 Cowboys) and (#6 Eagles at #3 Saints). And whoever wins those games would then travel to take on either San Francisco or Green Bay in the next round..