India is holding a mammoth election with nearly
a billion voters
The general election is the largest democratic exercise ever - almost one in eight people in the world can vote.
On 19 April, Indians will begin choosing a new parliament for the next five years, as Prime Minister Narendra Modi seeks a third consecutive term.
Scroll down to find out all about the staggering scale of the exercise, the powerful personalities and issues on which the election will be fought.
Opinion polls put Mr Modi's Bharatiya Janata Party (BJP) and its allies ahead. They are up against the Indian National Developmental Inclusive Alliance (India), which groups more than two dozen opposition parties including Congress, which was dominant for decades until the BJP took office in 2014.
The election to the lower house (Lok Sabha) is taking place in a bitter atmosphere. The opposition say they have been denied a level playing field, with many leaders raided by federal law enforcement agencies. Congress said tax authorities had frozen its bank accounts for six weeks, hampering its campaign finances. Some opposition leaders, including popular Delhi Chief Minister Arvind Kejriwal, have been jailed on corruption charges they deny.
The opposition has appealed to India's electoral authorities to intervene but the Election Commission itself has faced questions over its independence. The commission says it is providing a level playing field for all parties and candidates and treating them equally.
With 1.4 billion people, India is the world’s most populous country and the numbers around the election are mindboggling. Polling to elect 543 MPs will run in seven phases over six weeks, ending on 1 June. Results are on 4 June.
Some 969 million citizens are eligible to cast their ballot. To give you an idea, if you add together the populations of the US, Russia, Japan, Britain, Brazil and France - that comes close to how many Indians are on the electoral rolls. Since we are still a bit short, let's also throw in Belgium.
Voting is staggered for security and logistical reasons. For the first time, the Election Commission has said elderly and disabled people can vote from home by postal ballot.
Nearly 1.5 million polling booths have been set up across the country, with Chief Election Commissioner Rajiv Kumar vowing to “take democracy to every corner of India”.
“Our teams will walk the extra mile to reach every voter, whether they are in jungles or on snowy mountains. We will go on horseback, elephants, mules or helicopters. We will reach everywhere.”
While most polling booths are in schools, colleges and community centres, unusual locations are sometimes chosen - like shipping containers, mountain tops or forests.
And when the commission says “every voter counts”, it’s not just a slogan. In the 2019 general election, five officials travelled by bus and on foot for two days so that a lone voter – a 39-year-old woman in the north-eastern state of Arunachal Pradesh – could exercise her franchise.
The most politically crucial state is Uttar Pradesh (UP). With more than 240 million people, it’s India’s most populous state and sends more MPs to parliament than any other. Analysts say “the way to Delhi is through UP” and a party that does well here is usually well-placed to rule India - eight of India’s prime ministers trace their roots to the state.
The BJP won 71 of UP's 80 seats in 2014, a figure that dipped to 62 in 2019. Mr Modi, who is from Gujarat, chose UP to make his debut as an MP in 2014. He held his seat in the ancient city of Varanasi in 2019 and aims to do so again this year.
Some of the other key states are:
At the other end of the spectrum are three states in the north-east - Sikkim, Nagaland and Mizoram - and the federally-administered regions of Andamans, Lakshadweep and Ladakh, which elect one MP each.
Most of India - 22 states and federally-administered regions - need only one day for voting but some parts take longer. Uttar Pradesh, West Bengal and Bihar will vote in all seven phases.
The elections will decide the fate of thousands of candidates from six recognised national parties - including the BJP, the Congress, Delhi’s governing Aam Aadmi Party and the Communist Party of India (Marxist) - as well as 58 recognised state-level parties. Candidates from many smaller parties will also be in the fray.
All eyes, however, will be on the heavyweights:
Narendra Modi
Prime Minister Modi, who is eyeing a historic third term, remains the frontrunner, with early opinion polls predicting his return. If the 73-year-old wins, he will equal the record of Jawaharlal Nehru, India's first premier.
A polarising figure, Mr Modi remains a mass leader with millions of supporters who credit him with good governance and improving India’s standing internationally. But critics say his brand of muscular Hindu nationalism excludes minorities and he is out to change the secular fabric of the country.
Mr Modi’s use of religion and religious symbolism has proved potent in a country where 80% of the population is Hindu.
His catch-phrase for the 2024 election is “abki baar, char sau paar [this time we’ll cross 400 seats]”, a target the BJP has set for itself and its allies. A party needs 272 seats to win in India's first-past-the-post system - in 2019, the BJP won 303.
Amit Shah
The man powering Mr Modi’s election juggernaut is Home Minister Amit Shah. He’s charted numerous successful election campaigns for the BJP.
Like his mentor, he’s a polarising figure. Supporters say he defends the Hindu faith. He is seen as the driving force behind controversial laws, from scrapping Kashmir's partial autonomy to citizenship legislation that critics call anti-Muslim.
Yogi Adityanath
Mr Adityanath, the shaven-headed, saffron-robed Hindu monk-turned-chief minister of Uttar Pradesh, is considered the biggest mass leader in the BJP after PM Modi. He’s not standing in the general election but is playing a major role in the campaign in the bellwether state.
He's a holy man to his many followers but critics call him a divisive politician who has used public rallies to whip up anti-Muslim hysteria. During his seven years in office, lynchings and hate speech against Muslims have often made headlines.
Rahul Gandhi
Mr Gandhi, who has never won a national election or been a minister, is the most prominent opposition leader. Most of this is down to his lineage: his great-grandfather Jawaharlal Nehru was independent India’s first PM and his grandmother and father both later served as prime ministers.
But as the BJP has risen over the past decade, Congress has shrunk. Some of the blame has been laid at the door of Mr Gandhi, who critics called “the reluctant prince” in his early years in politics.
He’s worked hard to counter that impression, including taking two long treks across the country aimed at “uniting Indians against hatred and fear".
Nonetheless, opinion polls put Congress well behind the BJP.
Sonia Gandhi
When Congress was last in office a decade ago, Mr Gandhi’s Italian-born mother Sonia was considered the most powerful woman in India. But the 77-year-old has been in poor health and has lost much of her political influence.
She maintains a hold over the party as chairperson. In January, Mrs Gandhi moved to the upper house so she is not contesting the Lok Sabha election.
Priyanka Gandhi
One name that does the rounds before every election is that of Priyanka, Mr Gandhi’s charismatic sister – although she has never run for parliament.
Resembling her grandmother – former PM Indira Gandhi – she has campaigned extensively for Congress, winning praise for connecting with people. This time, too, supporters are clamouring for her to stand for election.
Arvind Kejriwal
One opposition figure looming over the election is Arvind Kejriwal, Delhi’s firebrand chief minister who is currently in jail.
He made his name as an anti-corruption crusader whose relatively young Aam Aadmi Party (AAP) beat both the BJP and Congress three times in a row to control the capital. It's also in power in Punjab.
But in March he joined several of his senior party leaders when he was arrested. He's denied corruption charges and accuses the government of being vindictive. Supporters fear his arrest will dent the AAP’s election campaign.