Today is Primary Day in New York. Know what is special.

Tuesday is primary day in New York.

Several high-profile races are being contested, including a costly and bitter Democratic contest between Reps. Jamaal Bowman and George Latimer in a district covering parts of Westchester County and the Bronx.

Other congressional contests have also generated interest, including a contest on eastern Long Island, where a media and political veteran entered the Democratic primary late against an established candidate.

The Democratic-led state Legislature is also up for election in November, and several primary seats for the Assembly are expected to be closely contested.

Here’s what’s worth knowing.

Voting begins at 6 a.m. and closes at 9 p.m. Voters can find their local polling place on the Board of Elections website.

New York is a closed primary state, meaning Democrats and Republicans can only vote in their parties’ primaries. Unaffiliated or independent voters cannot participate in the primaries. The deadline to register to vote before the primaries was June 15, and early voting ended on Sunday.

All absentee ballots must be submitted to a polling station by 9 p.m. or be postmarked June 25.

The outcome of Tuesday’s contest between Mr. Bowman and Mr. Latimer in the 16th Congressional District could prove to be a harbinger of many political norms.

This primary election could test the strength of the Democratic Party’s progressive bloc: If Mr. Bowman loses, he would be the first member of the House’s left-wing “clique” to be removed from office.

And it could be seen as a barometer of what a diverse group of voters thinks about Israel; the district has some of the nation’s wealthiest white suburbs and an influential Jewish community, but nearly half of its residents are African American or Latino.

Mr Bowman has been one of the House’s most outspoken critics of Israel and was one of the first MPs to call for a ceasefire in Gaza, but his repeated criticisms have at times veered into conspiracy theories and invited charges of anti-Semitism. Mr Latimer is largely pro-Israel, and calls for the return of all hostages before any potential ceasefire.

The race could also serve as a road map for groups seeking to influence the race through outside spending. Mr. Latimer has received $14.5 million in support from the American Israel Public Affairs Committee.

The importance of the race has been reflected in the involvement of some of the left’s biggest stars, including Representative Alexandria Ocasio-Cortez of New York and Senator Bernie Sanders of Vermont, who have campaigned on Mr. Bowman’s behalf. That has included negative characterizations, with Mr. Latimer describing Mr. Bowman as distracted by national politics and out of touch with the needs of his district, and Mr. Bowman repeatedly accusing Mr. Latimer of racism.

The Democratic primary in New York’s First Congressional District, which includes many wealthy neighborhoods on eastern Long Island, was expected to be fairly typical. Retired chemistry professor Nancy Goroff, who ran in 2020, seemed like the perfect candidate to vie for the nomination and face Republican candidate Nick LaLotta.

That changed sharply in February, when John Avlon, a former CNN political analyst who helped found the centrist political group No Labels, joined the race.

Mr. Avlon moved to the district in 2017, when he and his wife, Margaret Hoover, a conservative host on PBS, bought a home in Sag Harbor. Ms. Goroff, by contrast, has lived in Suffolk County for more than two decades, and has tried to out-compete Mr. Avlon, a carpet merchant.

They have also highlighted Mr. Avlon’s ties to the Republican Party, particularly his past work for Rudolph W. Giuliani, while Mr. Avlon has consistently drawn attention to Ms. Goroff’s 10-point loss to Lee Zeldin in November 2020.

The winner will face an uphill battle in November; the Cook Political Report rates the seat as “likely Republican.”

In Central New York, State Senator John W. Manion faces Sarah Cleary Hood, an Air Force veteran and a town councilor in DeWitt. Both Democrats are vying to challenge Representative Brandon Williams, a Republican who is considered the most vulnerable of New York’s incumbent lawmakers.

The race was marred by last-minute allegations by former staffers of Mr. Manion that claimed he fostered a hostile workplace. Mr. Manion has strongly denied these claims, which are being investigated by the state Senate.

A long-standing rift between institutional and progressive Democrats has dominated many debates inside the state legislature, particularly those over housing and criminal justice. Progressives feel their Democratic colleagues haven’t done enough for working-class people of color, while mainstream lawmakers are skeptical that left-wing agitators can bring lasting change.

This tension is playing out in Assembly primaries across the state. In Bedford-Stuyvesant, Brooklyn, Assemblywoman Stephanie Zinnerman is facing a challenge from first-time candidate Ion Huntley, who has the backing of the Democratic Socialists of America. Ms. Zinnerman has the support of House Majority Leader Hakeem Jeffries and state Attorney General Letitia James.

In the Hudson Valley, six-term legislator Didi Barrett is trying to survive a primary election against Claire Cousins, who has questioned Ms. Barrett’s record on environmental issues while also building her campaign on the need for more affordable housing.

And in East Harlem, Assemblyman Eddie Gibbs is being challenged by Javier Santiago, the head of the local community board. The race has turned into a debate over representation, with many personal insults hurled between the two candidates. Mr. Gibbs, who is black, has said efforts to defeat him are focused on having a Latino represent the district, which is 41 percent Hispanic.

Grace Ashford, Jeffrey C. Mays And Nicholas Fundos Contributed reporting.