Why Israel wants the Philadelphi Corridor

Despite pressure at home and abroad, Israeli Prime Minister Benjamin Netanyahu vows to seize the Philadelphi Corridor in Gaza and he says he will not accept a ceasefire deal until the border area is in Israel's hands. But taking the corridor risks prolonging the war leading to the death of more Palestinian and Israeli hostages, making Hamas less willing to negotiate and tearing up the peace treaty with Egypt. What is the Philadelphi Corridor and why does Israel want it?