Hamas and Fatah agree to form a government. What does it mean and who are these Palestinian groups?

RAMALLAH, West Bank (AP) — Palestinian factions and bitter foes Hamas and Fatah signed a declaration in China vowing to form a unity government to govern the occupied West Bank and Gaza Strip following the end of the Israel-Hamas war.

The agreement announced in Beijing on Tuesday, which also included 12 smaller Palestinian parties, could start the thawing of relations and potential reconciliation of the two heavyweights of Palestinian politics who have long been at odds over the governance of the Palestinian territories.