Bab-e-Baqi (Door of Baqi)

Bab-e-Baqi is the door on the eastern side of Masjid-e-Nabwi which faces Jannatul Baqi and is the closest door to the Rawdah Mubarak (the Sacred Chamber).

The Bab-e-Baqi was installed in 1408 AH and is exactly opposite to Bab-e-Salam which is on the western side.
This door is to facilitate the flow of people leaving the masjid after giving salutation to the Prophet (ﷺ) and his two companions.
Note that this door did not exist in the time of the Prophet (ﷺ).

References: History of Madinah Munawwarah – Dr. Muhammad Ilyas Abdul Ghani

Bab-un-Nisa (Door of the Women)