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For decades, the Democratic People's Republic of Korea - more commonly known as North Korea - has been one of the world's most secretive countries.
Its government doesn't like people from outside the country going there and finding out what's going on.
It shares a border with a country called South Korea - and the two countries have not got on with each other for a long time.
A North Korean leader had not stepped foot in South Korea for 65 years and the leaders of the countries had not met for 10 years.
But that changed in April 2018 when North Korean leader Kim Jong-un met with the president of South Korea Moon Jae-in at the border between the two countries. The meeting was a significant moment in modern history.
To better understand the relationship between the two countries, we need to look back over the last few decades at the history of this secretive country.
Why is there a North Korea and a South Korea?
Image captionThis picture shows tanks being displayed during a military parade
Korea used to be one country but was divided after the Second World War. It had been ruled by Japan but when Japan surrendered, forces from the Soviet Union occupied the north of the country while US forces occupied the south.
The Soviets supported a system of rule called communism, while the US was anti-communist. It meant the two sides could not agree on how to unite the country, so it was formally divided into North Korea and South Korea on 9 September 1948.
The political differences between the two rival states led to the outbreak of war in 1950, when North Korea invaded South Korea.
The war lasted three years but North Korea and South Korea have officially remained at war because a peace treaty was never signed.
Who's in charge?
Image captionNorth Korea's first leader Kim Il-sung (left) was succeeded by his son Kim Jong-il (right)
Since 1948, North Korea has been ruled by three men from the same family.
Kim Il-sung was the country's first supreme leader, who was in charge until his death in 1994.
Control passed next to his son Kim Jong-il, who held power for 17
In 2011, North Korea announced Kim Jong-il's son, Kim Jong-un, as its new leader .
Around one million people gathered in the capital city, Pyongyang, to hear the announcement.
What is life like in North Korea?
North Korea is home to more than 25 million people, who live under a form of communist rule, which strictly controls all areas of daily life.
People have to ask permission to travel around and it's difficult for visitors to enter the country too.
All TVs and radios are tuned to state channels and people caught listening to foreign broadcasts face harsh punishments.
These controls mean that most North Koreans may have little or no idea of world events, or how their country is thought of by the outside world.
Most North Koreans are extremely poor with things like fridges, washing machines, and even bicycles, hard to come by.
Many people rely on aid agencies, such as the United Nations, to provide food because there is not enough to eat in the country.
However, North Koreans who demand more from their government, demand a change in leadership, or those that just try to escape, are brutally punished and sometimes killed.
An Amnesty International report estimated that hundreds of thousands of people have been put in prison and labour camps because they have disagreed with the government.
Image captionNorth Korean people dance during an event to mark the 85th anniversary of the country's army
North Koreans seem to cheer and praise their leader at big public events but it's difficult to know the reasons for this because it's not possible to speak freely to people living there.
The North Korean government says it's because Kim Jong-un is very popular with his people.
From an early age, North Koreans are taught that their leaders are like all-powerful gods.
But others argue that people could be cheering Kim because they are worried that they would get in serious trouble if they didn't.
Why are people worried about North Korea?
One of the main issues that has seen North Korea make headlines in the news is to do with nuclear missiles.
North Korea had been trying to make nuclear missiles - powerful bombs that can cause devastating damage - which one day might be able to hit targets in the US.
It wasn't believed that it was building any missiles that could travel to and strike the UK, which is around 8,400 kilometres away.
US President Donald Trump sent warships and submarines to South Korea, a country which America has supported for a long time, to try to get Kim Jong-un to stop his weapon-building plans.
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