Prime Minister Rishi Sunak has described the Good Friday Agreement as an "incredible moment in our nation's history" as he prepares to commemorate its 25th anniversary with US President Joe Biden in Belfast this week.

The 1998 peace deal ended Northern Ireland's decades-long violent conflict known as the Troubles.

Mr Sunak will welcome the US president to Northern Ireland on Tuesday evening.

They will attend events in Belfast to mark 25 years since the agreement.

The prime minister said that "making good" on the promise of a better future for Northern Ireland was foremost in his mind ahead of the anniversary.

"[The agreement] was a powerfully rare example of people doing the previously unthinkable to create a better future for Northern Ireland," said Mr Sunak.

"It is that promise of a better future that we offered to everyone in Northern Ireland that I will be thinking of first and foremost over the coming days.

Read more about the agreement

EXPLAINER - What is the agreement?

ANALYSIS - The winding road to peace

REFLECTION - Is the role of women forgotten?

On Wednesday Mr Sunak will address a Queen's University Belfast conference about the Good Friday Agreement and will later host a gala dinner to commemorate the anniversary.

He has also announced that the UK will host a Northern Ireland investment summit in September.

It will connect international investors with Northern Ireland businesses and showcase the "best of what Northern Ireland has to offer", said the government.

What will Joe Biden do in Belfast?

President Biden is due to make a speech at Ulster University's newly-opened Belfast campus on Wednesday.

It is understood that he will leave Northern Ireland that afternoon to travel to the Republic of Ireland.

His visit to Northern Ireland will be shorter than many people had expected when it was first announced last month.

But the UK and Irish government have said it should not be seen as a snub.

Northern Ireland Secretary Chris Heaton-Harris said people should "make the most" of the visit and ensure it was a "positive event".

Tánaiste (Irish Deputy Prime Minister) Micheál Martin said it would be a "manifestation of [Mr Biden's] genuine commitment to the people of Northern Ireland".

"There are many countries across the EU that would love a visit from the American president," he added.

Where will the president visit in Ireland?

During his three days in the Republic of Ireland, Mr Biden will attend engagements in Dublin, County Louth, and County Mayo.

The White House has said he is expected to address the Oireachtas (Irish parliament) on Thursday.

Taoiseach (Irish Prime Minister) Leo Varadkar said he was delighted that President Biden would be visiting Ireland.

"When we spoke recently in the White House President Biden was clear that in celebrating the Good Friday Agreement we should be looking ahead, not backwards," he said.

Declan Harvey and Tara Mills explore the text of the Good Friday Agreement - the deal which heralded the end of the Troubles in Northern Ireland.

They look at what the agreement actually said and hear from some of the people who helped get the deal across the line.

Listen to all episodes of Year '98: The Making of the Good Friday Agreement on BBC Sounds.