The Sun is a daily tabloid newspaper published in the United Kingdom and Ireland (where it is known as The Irish Sun) with the highest circulation of any daily English-language newspaper in the world and the biggest circulation within the UK, standing at an average of 3,121,000 copies a day between January and June 2008 and with a daily readership of approximately 7,900,000, of which 56 percent are male and 44 percent female. By circulation it is the eighth biggest newspaper in any language in the world, one place behind its Sunday stablemate the News of the World, although their circulations are close and these places were briefly reversed during May 2008. It reaches 2.9 million readers in the ABC1 demographic and 5.0 million in the C2DE demographic, compared to the 1.5 and 0.1 million respectively of its broadsheet stablemate The Times.

It is published by News Group Newspapers of News International, itself a subsidiary of Rupert Murdoch's News Corporation. The Sun was first published as a broadsheet on 15 September 1964 - with a logo featuring a glowing orange disc. It was launched by owners IPC (International Press Corporation) to replace the failing Daily Herald.

The name was acquired from the Student newspaper the SUN (Student University News) published by Aston University Student's Guild, with their newspaper being renamed the Birmingham SUN. The paper did not live up to IPC's expectations. Circulation continued to decline and it was soon losing even more money than the Herald had done.

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