In journalism, yellow journalism is the use of eye-catching headlines and sensationalized exaggerations for increased sales, while the yellow press are American newspapers which do so. This term is chiefly used in American English, whereas in the United Kingdom, the similar term tabloid journalism is more common. Other languages, e.g. Russian (жёлтая пресса zhyoltaya pressa), sometimes have terms derived from the American term. Yellow journalism emerged in the intense battle for readers by two newspapers in New York City in the 1890s. It was not common in other cities.

Joseph Pulitzer purchased the New York World in 1883 and told his editors to use sensationalism, crusades against corruption, and lavish use of illustrations to boost circulation. William Randolph Hearst then purchased the rival New York Journal in 1895. They engaged in an intense circulation war, at a time when most men bought one copy every day from rival street vendors shouting their paper's headlines. The term "yellow journalism" originated from the innovative popular "Yellow Kid" comic strip that was published first in the World and later in the Journal.

This type of reporting was characterized by exaggerated headlines, unverified claims, partisan agendas, and a focus on topics like crime, scandal, sports, and violence. Historians have debated whether yellow journalism played a large role in inflaming public opinion about Spain's atrocities in Cuba at the time, and perhaps pushing the U.S. into the Spanish-American War of 1898. Most historians say it did not do so. The two papers reached a large working class Democratic audience, while the nation's upscale Republican decision makers (such as President William McKinley and leaders in Congress) seldom read the yellow press.

Journalism historian W. Joseph Campbell described yellow press newspapers as having daily multi-column front-page headlines covering a variety of topics, such as sports and scandal, using bold layouts (with large illustrations and perhaps color), heavy reliance on unnamed sources, and unabashed self-promotion. The term was extensively used to describe two major New York City newspapers around 1900 as they battled for circulation.

Journalism historian Frank Luther Mott used five characteristics to identify yellow journalism:

Another common feature was emphasizing sensationalized crime reporting to boost sales and excite public opinion.

An English magazine in 1898 noted, "All American journalism is not 'yellow', though all strictly 'up-to-date' yellow journalism is American!"

The term was coined in the mid-1890s to characterize the sensational journalism in the circulation war between Joseph Pulitzer's New York World and William Randolph Hearst's New York Journal. The battle peaked from 1895 to about 1898, and historical usage often refers specifically to this period. Both papers were sensationalizing the news in order to drive up circulation, although the newspapers did serious reporting as well. Richard F. Outcault, the author of a popular cartoon strip, the Yellow Kid, was tempted away from the World by Hearst and the cartoon accounted substantially towards a big increase in sales of the Journal.