Short answers, pulled from the story.
Bosniaks are a South Slavic ethnic group native to Bosnia and Herzegovina, where they constitute the largest ethnic group. They are also recognized as one of the three constitutive nations of Bosnia and Herzegovina under the Dayton Agreement, alongside Serbs and Croats. Significant Bosniak communities also live in Serbia, Montenegro, Croatia, and Kosovo.
The mass Islamisation of Bosnia did not begin immediately after the Ottoman conquest in 1463; it accelerated in the 1480s in central Bosnia and reached full intensity in the 16th century. By the early 1600s roughly two-thirds of Bosnians were Muslim, though the conversion process was still incomplete in the 17th century, with some converts continuing to pay taxes as Christians did.
On the 27th of September 1993, leading political, cultural, and religious representatives of Bosnian Muslims voted at an assembly to adopt the Bosniak name, citing the need for a distinct national identity to secure their place in Europe during the Bosnian War. Prior to that assembly, only 1.8 percent of Bosnia and Herzegovina's citizens had supported the Bosniak national identity in a 1990 poll. The decision was framed as returning to a historical name tied to Bosnia and Herzegovina's state-legal tradition.
The word Bosniak derives from the name Bosnia, which is traced to the river Bosna, believed to be a pre-Slavic hydronym possibly mentioned as early as the 1st century AD by Roman historian Marcus Velleius Paterculus. In Slavic languages the suffix -ak creates a masculine noun from a place name, making Bosniak the equivalent of "native of Bosnia." The earliest attested use of the modern form in Bosnian diplomatic records dates to 1440, in correspondence from Bosnian king Tvrtko II to the Polish king of Hungary.
Bosniaks were officially recognized as a nationality in Yugoslavia in 1971, when the census introduced the option "Muslims by nationality." An earlier amendment in 1968 had introduced a "Muslim nationality" for Slavic Serbo-Croatian-speaking Muslims, but full recognition came with the 1971 census, which recorded 1,482,430 Muslims in Bosnia and Herzegovina, representing 39.6 percent of that republic's population.
Genetic studies show that Bosniaks are closely related to neighboring South Slavic populations, with no significant Middle Eastern genetic contribution despite their Islamic heritage. Y-DNA analysis found that Bosnian Serbs and Bosniaks are genetically closer to each other than either is to Bosnian Croats. A 2023 archaeogenetic study confirmed that more than half of the ancestry of most Balkan peoples today originates from medieval Slavic migrations.