President Trump laid out an ambitious plan for the future of Gaza at a news conference on Monday, with Prime Minister Benjamin Netanyahu of Israel standing beside him, and both said it could finally stop the devastating conflict with Hamas.

The proposal envisions an immediate end to the war and the release of all remaining hostages in Gaza. Hamas would lay down its arms and give up any power it still has over Gaza. A transitional government would be established.

But it is far from clear whether those terms would be acceptable to the Hamas, the Palestinian militant group that has fought a determined guerrilla war against Israel for two years. So far, Hamas has stubbornly rejected the idea of surrendering its weapons or disbanding its battalions of armed fighters.

Here’s what to know about the U.S.- and Israeli-backed plan for Gaza’s future.

Who’s behind it?

The Trump administration developed the plan with counsel from Tony Blair, the former British prime minister. In August, Mr. Blair attended a high-level meeting at the White House to discuss day-after proposals for Gaza alongside Jared Kushner, the president’s son-in-law, who has played a role in the past in shaping Mideast policy.

And over the past week, Israel and Arab countries held additional conversations with American officials about the proposal before it was announced on Monday.