The 2020-2021 season's playoffs format is gonna be unique given the circumstances. The top 4 team in each division make it to the playoffs, where they play against each other based on rankings. That is 1st team against the 4th, 2nd vs the 3rd. There are no wild card teams this year.
The divisional rounds are played till there are 4 teams left, the 4 division winners. These 4 teams will then play each other based on regular season points, till the Stanley Cup champion is determined. All series are best of 7.