The International Court of Justice (ICJ) is being asked to consider whether Israel is committing genocide against the Palestinians in Gaza.
South Africa brought the case to the court.
Israel has strongly rejected the allegation, calling it "baseless".
What is the International Court of Justice?The ICJ is the United Nations' top court.
Based in the Hague, in the Netherlands, it was established after World War Two, to settle disputes between states and give advisory opinions on legal matters, which is what it is being asked to do with Israel.
Unlike the International Criminal Court (ICC), the ICJ cannot prosecute individuals for crimes of the utmost severity, such as genocide.
But its opinions carry weight with the UN and other international institutions.
What is genocide and what is the case against Israel?
South Africa alleges Israel is committing genocide against the Palestinians, in the wake of Hamas's 7 October attack.
Hundreds of Hamas gunmen crossed from the Gaza Strip into southern Israel, killing 1,300 people, mainly civilians, and taking about 240 hostages back to Gaza.
Since Israel launched its military campaign against Hamas in response, more than 25,000 people, mainly women and children, have been killed in Gaza, according to the Hamas-run health ministry.
And evidence submitted by South Africa claims "acts and omissions" by Israel "are genocidal in character because they are intended to bring about the destruction of a substantial part of the Palestinian national, racial and ethnical group".
This refers both to what Israel is actively doing, such as carrying out air strikes, and what it is allegedly failing to do, such as, according to South Africa, preventing harm to civilians.
And the case highlights Israeli public rhetoric, including comments from Prime Minister Benjamin Netanyahu, as evidence of "genocidal intent".
Under international law, genocide is defined as committing one or more acts with the intention to destroy, in whole or in part, a national, ethnic, racial or religious group.
Those acts are:killing or causing serious bodily or mental harm to members of the group
deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part
imposing measures intended to prevent births within the group
forcibly transferring children of the group to another group
How has Israel responded to the allegations of genocide?Israel has fiercely rejected South Africa's claim.
Mr Netanyahu said: "No, South Africa, it is not we who have come to perpetrate genocide, it is Hamas.
"It would murder all of us if it could.
"In contrast, the IDF [Israel Defense Forces] is acting as morally as possible."
Israel's military says it takes a raft of measures to avoid civilian casualties.
Can the court make Israel stop the war in Gaza?South Africa wants the ICJ to order Israel to "immediately suspend its military operations in and against Gaza".
But it is virtually certain Israel would disregard such an order and could not be made to comply.
Rulings are theoretically legally binding on parties to the ICJ - which include Israel and South Africa - but in practice, unenforceable.
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