A two-month truce has been agreed by warring parties in Yemen, the UN says.
It is the first nationwide truce agreed since 2016 in a war which has killed nearly 400,000 people, according to UN estimates.
About 60% died from hunger, lack of healthcare and unsafe water.
The deal between the Saudi-led coalition and Iran-backed Houthi rebels - which can be extended if both agree - is scheduled to come into effect at 16:00 GMT on Saturday.
Saturday is the first day of the Muslim holy month of Ramadan for many Muslims.
US President Joe Biden hailed the UN-brokered truce as a long-awaited "reprieve for the Yemeni people".
But he added: "These are important steps, but they are not enough. The ceasefire must be adhered to, and as I have said before, it is imperative that we end this war."