Today's talks are not the first time North and South have sat down at the highest level.

In 1998, then-president of South Korea Kim Dae-jung started a so-called Sunshine Policy of engagement with the North. This led to the first inter-Korean summit in 2000 and both humanitarian and economic co-operation. The next summit was in 2007 and ended with an agreement of both sides vowing to resolve the nuclear issues, to end military hostilities and sign a permanent peace treaty.

But the deal fell through after the North resorted to nuclear and missile tests and when the South elected more conservative presidents opposed to the Sunshine Policy.

While there's rolling coverage of Moon Jae-in arriving, we know very little about Kim Jong-un's trip to the talks.

What we do know is that he is bringing a fellowship of nine across the border with him. Surprising no-one, among them is his sister, Kim Yo-jong who has taken on an increasingly prominent role in recent months.

He's also bringing various of his military leaders, his defence minister and his most-trusted diplomats.

Here's some more on the nine.

Image source, AFP

The talks take place in Panmunjom, the place where the Korean War Armistice was signed. Ever since, it has been a crucial venue for inter-Korean talks. The village sits in the no-man's land of the DMZ. In fact a highly militarised stretch, it has seen its share of conflict.

The last such event was the dramatic escape of a defector from the North in 2017. The village is very much on the international map: several US presidents have visited it to show their support to Seoul and it's even a popular tourist destination from the South.

Image source, Getty Images

President Moon's convoy has arrived at the Peace House in Panmunjom - there's just over 20 minutes left until the historic talks are due to begin.

Image source, Reuters

Another stretch of cheering crowds along the president's convoy. By now, Mr Moon has arrived at the border and in about half an hour, will for the first time stand face to face with his North Korean counterpart.

Image source, AFP

Along Mr Moon's route there have been crowds cheering and waving. While there is a lot of support for today's talks, there are other South Koreans who are more cautious, doubting the North's intentions are as genuine as they appear.

President Moon's motorcade has been driving north - followed by the world's TV cameras and helicopters - for about an hour now. He's gone over the unification bridge, and is now inside the demilitarized zone - the DMZ.

Image source, AFP

Renewing economic co-operation means the Kaesong industrial complex. It's a site just north of the border where until 2016 North Koreans worked for South Korean companies.

The site was - controversially - suspended as a protest against North's nuclear and missile tests and in a row over what North Korea was doing with its workers salaries.

The whole project was the result of previous inter-Korean summits and restarting it would mark a major breakthrough in cooperation between the two sides.

Image source, Getty Images

But the biggest point on today's agenda: denuclearisation. North Korea has been working on its nuclear programme for years, in breach of international rules. Pyongyang says the nukes are a deterrent against its global enemies and has carried out six nuclear tests so far. Now it says it's ready to discuss the issue - it's not clear though what that means and what it will want in return.

Here's what South Korea will likely want to get through in today's chat;

• economic co-operation
• improving ties between Seoul and Pyongyang
• work on a peace treaty - the Korean War ended without one
• lay the groundwork for the talks between Mr Kim and Donald Trump in the coming weeks or months

What's actually going to happen at these talks? Short answer, we don't entirely know. And in a briefing on Thursday, South Korean officials suggested they weren't sure either what the outcome would be. But talks will focus on North Korea's recent suggestion it could give up its nuclear weapons - if it's what many hope, that's a huge shift in policy from Pyongyang, which has aggressively pursued a nuclear agenda for years and fiercely insisted it has to right to do so.

Read more about what we can expect from the talks here.

Mr Kim will cross the border here, in the demilitarized zone which, despite its name, is one of the world's most guarded frontiers. Here's a little backgrounder on Panmunjom, known as the truce village.

Image source, AFP

South Korean President Moon Jae-in left early Friday morning from the Blue House in Seoul, waving to his supporters. He's now still on the way driving to the border where he is to pick up Kim Jong-un for their talks.

Image source, AFP

The meeting involves two leaders with very different biographies: Kim Jong-un (left) is the third generation of his family to lead North Korea under a communist dictatorship, while the South’s Moon Jae-in has for most of his political life been engaged in reconciliation attempts.

We'll be bringing you all the news as it happens, along with analysis from our own correspondents in South Korea, the BBC Korean service, experts around the world and any other observations along the the way. We're also broadcasting events live on BBC World.

The BBC's Laura Bicker will be at the scene all day.

One year ago, few could have imagined this meeting taking place. Pyongyang's relations with Seoul and Washington seemed to deteriorate steadily. But in January, Kim Jong-un said his country wanted to take part in the South Korea Olympics. The talks that followed led to the plans for this inter-Korean summit and for talks with President Donald Trump in the coming months.

Want a quick update? Here's our North Korea crisis in 300 words.

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Image source, Reuters

Both the leaders and their entourages are on the move towards the border. It's going to be a day in the spotlight as much of their meeting will be broadcast live on TV.

We'll be bringing you all the news as it happens, along with analysis from our own correspondents in South Korea, the BBC Korean service, experts around the world and any other observations along the the way. We're also broadcasting events live on BBC World.