It is the biggest day yet in the world’s biggest election.
Indians started voting on Monday and today the capital Delhi is joining in.
Rahul Gandhi of the famous political dynasty is heading the ruling Congress party’s push to hold onto power, alongside his Italian-born mother Sonia.
The big challenge comes from Hindu nationalist Narendra Modi, the main opposition BJP’s candidate for prime minister.
In Delhi alone, there are more than 12 million potential voters.
A key figure is the Aam Aadmi anti-corruption party leader Arvind Kejriwal who is hoping success on the national stage will follow a local election triumph in Delhi last year.
Nationwide, more than 815 million people are registered to vote over the next five weeks.
Tens of thousands of security personnel and mobile police squads are being deployed for the ballot in the capital. All votes will be counted on May 16.