Turnout in Israel's election is at its highest so far since 1977, as Israelis vote in what many view as one of the most pivotal elections in the country's history.
Polling published on Friday suggests incumbent Benjamin Netanyahu is almost neck-and-neck with former military chief Gadi Eisenkot in the race to become prime minister.
But neither of their political blocs are projected to win the 61 seats needed to form a majority government - meaning weeks or months of political wrangling may lie ahead.
The campaign has been shaped by the issues of democracy and security, and the election is widely being seen as a referendum on Netanyahu's rule.
Many leading parties complained on Tuesday morning of alleged irregularities at polling stations across the country - but Israel's Central Election Committee (CEC) says there is no evidence of systematic tampering with ballot slips.
Israel's proportional representation system means governments have always been coalitions - and the race to power can, and has, produced unexpected alliances. But this election looks especially tight - and lines in the sand have already been drawn.
Eisenkot, who leads the newly formed Yashar Party, is the main figure in the so-called "change bloc", a collection of parties who have ideological differences but share the goal of ousting Netanyahu.
Other leaders in the bloc include former prime minister Naftali Bennett and Avigdor Lieberman - both right-wingers who take hardline positions on security - and Yair Golan, a left-leaning former general.
For Netanyahu, a titan of Israeli politics who first served as prime minister in 1996, a return to power will hinge on another alliance with the far-right and ultra-Orthodox parties that make up his current governing coalition - the most right-wing in Israel's history.
There are two Arab party blocs in the running too, as about one-fifth of Israel's population is Arab - many of whom describe themselves as Palestinian citizens of Israel. In theory, they could prove kingmakers. But all but one of the leading Jewish parties have ruled out working with them.
The campaign has been dominated by the issue of security - with the opposition bloc hammering Netanyahu for the unprecedented security failure that led to the 7 October Hamas-led attacks on Israel, in which nearly 1,200 people were killed and 251 taken back to Gaza as hostages.
They have pushed for an independent commission of inquiry into the attacks - something Netanyahu has long resisted, insisting it would be biased against him.
They also point to what they see as threats to democracy under Netanyahu, who faces an ongoing trial on corruption charges - which he denies - and is still pursuing contentious plans for reforms to the judicial system, which led to mass protests before the 7 October attacks.
Despite the opposition's attack lines, Netanyahu has once again framed himself as "Mr Security" - pointing to what he says are strategic victories in Israel's wars across the Middle East and his close relationship with US President Donald Trump.
On Sunday, Israel's Channel 12 reported that Netanyahu had pushed for last-minute military action that could trigger a confrontation with Iran prior to the elections - but was opposed by his own military chief Eyal Zamir. The following day, CNN reported that he had also tried to persuade Trump to carry out new strikes on Iran, but that Trump had refused to give the green light. Netanyahu denied both reports.
He also made headlines in the final days of his campaign for posting an AI-generated image of a nuclear bomb hitting Tel Aviv, warning that he is the only leader who can protect Israel "if the Iranians acquire nuclear weapons". Eisenkot called him "hysterical".
Another dominating issue has been conscription, with Netanyahu's government failing to enforce a Supreme Court ruling that ultra-Orthodox Jewish men in full-time religious study should be conscripted to the military - a highly divisive move as thousands of others have been conscripted to fight in recent wars.
An unprecedented 70,000 people have reportedly flown home from abroad to vote, while hundreds of thousands are set to cast ballots for the first time.
At 22:00 (20:00 GMT) on Tuesday, Israeli broadcasters will publish exit polls. These will give some indication of the direction of voting, but can vary significantly.
Up and down the country, Israelis will gather to watch the results trickle in, with Netanyahu's Likud meeting in Jerusalem and Eisenkot's Yashar - formed only last year - assembling in Tel Aviv.
Hundreds of thousands of Israeli soldiers and reservists will also cast ballots, but many of those votes will not begin being counted until Wednesday - meaning there may be a late boon for the right-wing parties who are thought to have strong support from that demographic.
Though often framed as a run-off between Eisenkot and Netanyahu, it is possible another leader could take power, if they were to withhold their party's support for a coalition unless given the top job.
An outcome dreaded by many is political deadlock - where no bloc is able to reach a majority, and a minority government cannot be formed. In that scenario, new elections would be called, with Netanyahu to remain as interim prime minister.
Between 2019 and 2022, Israel held five separate elections as parties struggled time and again to co-operate.
