The UK’s new prime minister Theresa May has vowed to create a country that works for all not just the “privileged few”.
Speaking outside 10 Downing Street, the former home secretary said it would be her mission to “build a better Britain”.
She promised to give people who were “just managing” and “working around the clock” more control over their lives.
Mrs May is the UK’s second female prime minister, after Margaret Thatcher.
Her husband Philip was standing behind her as she made her first public speech in the role, highlighting the “precious bond” between England, Scotland, Wales and Northern Ireland and between “every one of us”.
She arrived at Downing Street from Buckingham Palace, where she officially accepted the Queen’s invitation to form a new government.
Earlier the Queen accepted Mr Cameron’s resignation as prime minister.
In his farewell statement outside Downing Street, Mr Cameron said Mrs May would provide “strong and stable leadership” and wished her well in her negotiations with the EU.
Mrs May, 59, suddenly won the Conservative leadership contest after rival candidate Andrea Leadsom pulled out on Monday.
One of her first tasks will be to appoint her new ministerial team.