They have to do a decent called "7 min of terror" because they have lost 50% of Rovers attempting it. It's called this because the sequence is so harrowing and happens faster than radio signals can reach Earth from Mars. That means the spacecraft is on its own once it enters the Martian atmosphere. They will actually use a rocket propelled sky crane for this
The following link is to Youtube to watch the decent live
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NFT: Mars Perseverance Lander '7 Minutes Of Terror' Thurs 2/18/21 - ( New Window )