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The Tories have dropped changes to the triple lock for pensions and winter fuel payments in order to secure a deal for a with the Northern Irish DUP for a working majority .
Theresa May said the DUP and the Conservative Party "share many values" and the agreement was "a good one".
Outside Downing Street, the DUP leader, Arlene Foster, said a £1.5bn funding package for Northern Ireland has been secured as part of the deal.
The money will be used to boost the region's economy and invest in new infrastructure, health, education and other sectors, she said.
She added that the funding would "address the unique circumstances" of Northern Ireland and the impact on its people.
UK-wide, the pensions triple lock will also stay in place and there will be no means-testing of winter payments.
The DUP and Conservatives have also agreed that a Nato commitment to spending 2 per cent of GDP on the armed forces will be adhered to, and that the Armed Forces' covenant will be fully implemented in Northern Ireland.
UK Election Day 2017Show all 38 Door of Number 10 Downing Street is seen on the morning after Britain's election in London
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Labour leader Jeremy Corbyn leaves his home in north London after he called on the Prime Minister to resign, saying she should "go and make way for a government that is truly representative of this country"
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Shadow Chancellor John McDonnell arrives at Labour Headquarters on June 9, 2017 in London, England. After a snap election was called by Prime Minister Theresa May the United Kingdom went to the polls yesterday. The closely fought election has failed to return a clear overall majority winner and a hung parliament has been declared
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Caroline Lucas, co-leader of Britain's Green Party, speaks after retaining her seat in the general election, in Brighton
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Patrons watch the results for Britain's election in London
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Leader of the Liberal democrats Tim Farron celebrates beating Conservative party candidate James Airey (R) following the announcement of the results at the Westmoorland and Lonsdale constituency count at Kendal Leisure Centre on June 9, 2017 in Kendal, United Kingdom. After a snap election was called, the United Kingdom went to the polls yesterday following a closely fought election. The results from across the country are being counted and an overall result is expected in the early hours
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Paul Nuttal, leader of the United Kingdom Independence Party reacts after failing to win the seat of Boston and Skegness at the counting centre for Britain's general election in Boston
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First Minister Nicola Sturgeon arrives at the Emirates Arena in Glasgow, as counting is under way for the General Election.
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Anna McMorrin hugs Jo Stevens MP after winning Cardiff North for Labour at the Sport Wales National Centre on June 9, 2017 in Cardiff, United Kingdom. After a snap election was called, the United Kingdom went to the polls yesterday following a closely fought election. The results from across the country are being counted and an overall result is expected in the early hours
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Vince Cable wins the Twickenham election for the Liberal Democrats. Richmond and Twickenham election
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Britain's Labour party leader Jeremy Corbyn rubs his face after arriving for the declaration at his constituency in London
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Emily Thornberry speaks after holding her Islington South and Finsbury seat at the Sobell Leisure Centre in Islington, north London
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Britain's Prime Minister Theresa May listens as the declaration at her constituency is made for in the general election in Maidenhead, England, Friday, June 9, 2017. British Prime Minister Theresa May's gamble in calling an early election appeared Friday to have backfired spectacularly, after an exit poll suggested her Conservative Party could lose its majority in Parliament
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Labour Party candidate Emily Thornberry smiles at a counting centre for BritainâÃôs general election in London
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Britain's Home Secretary Amber Rudd attends the count for her seat at a counting centre for Britain's general election in Hastings
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Ballots are counted at a counting centre for BritainâÃôs general election in London
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Election officials count votes in the Emirates Arena in Glasgow, Scotland
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BBC Television centre is illuminated with the exit poll results for Britain’s general election
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Members of the election staff prepare to count ballots, in Theresa May’s constituency in Maidenhead
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Ballot papers are checked ahead of the count at the Westmoorland and Lonsdale constituency count at Kendal Leisure Centre
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Ballots are counted at a counting centre for Britain’s general election in Kendal
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Theresa May arrives to vote at a polling station in Maidenhead
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Jeremy Corbyn arrives to cast his ballot at a polling station in north London
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"Our aim in these negotiations has been to deliver for all of the people of Northern Ireland," Ms Foster said.
"And the support measures which we are announcing will be to the benefit of all our people."
The DUP leader said the financial support would be made up of £1bn in new funding over the coming two years, as well as "new flexibility" in almost £500m already committed to the region.
Ms Foster said she would return to Northern Ireland for talks aimed at restoring a powersharing executive in Stormont, which was collapsed by Sinn Fein earlier this year amid a growing rift between the party and the DUP.
Both sides have until the end of the week to do a deal.
"Now, more than ever, our political leaders both locally and nationally need to work together to find solutions for all of the people we serve," added Ms Foster.
Theresa May responds to John Major criticism over DUP deal
The agreement restates the Government's support for the Belfast Agreement and the restoration of devolved government in Northern Ireland.
And it seeks to allay concerns over the Government's neutrality in negotiations, by saying that the DUP will have "no involvement in the UK Government's role in political talks in Northern Ireland".
Under the terms of the agreement, the Government has agreed to guarantee that cash support for Northern Irish farming will continue at the same level until the end of the Parliament in 2022, as the UK goes through Brexit.
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