Pulp magazines (often referred to as "the pulps") were inexpensive fiction magazines that were published from 1896 to the 1950s. The term pulp derives from the cheap wood pulp paper on which the magazines were printed; in contrast, magazines printed on higher quality paper were called "glossies" or "slicks". The typical pulp magazine had 128 pages; it was 7 inches (18 cm) wide by 10 inches (25 cm) high, and 0.5 inches (1.3 cm) thick, with ragged, untrimmed edges.
The pulps gave rise to the term pulp fiction in reference to run-of-the-mill, low-quality literature.
Pulps were the successors to the penny dreadfuls, dime novels, and short-fiction magazines of the 19th century. Although many respected writers wrote for pulps, the magazines were best known for their lurid, exploitative, and sensational subject matter. Modern superhero comic books are sometimes considered descendants of "hero pulps"; pulp magazines that often featured illustrated novel-length stories of heroic characters, such as The Shadow, Doc Savage, and The Phantom Detective.
The first "pulp" was Frank Munsey's revamped Argosy Magazine of 1896, with about 135,000 words (192 pages) per issue, on pulp paper with untrimmed edges, and no illustrations, even on the cover. The steam-powered printing press had been in widespread use for some time, enabling the boom in dime novels; prior to Munsey, however, no one had combined cheap printing, cheap paper and cheap authors in a package that provided affordable entertainment to young working-class people. In six years Argosy went from a few thousand copies per month to over half a million.
Street & Smith, a dime novel and boys' weekly publisher, was next on the market. Seeing Argosy's success, they launched The Popular Magazine in 1903, which they billed as the "biggest magazine in the world" by virtue of its being two pages (the interior sides of the front and back cover) longer than Argosy. Due to differences in page layout however, the magazine had substantially less text than Argosy. The Popular Magazine did introduce color covers to pulp publishing, and the magazine began to take off when in 1905 the publishers acquired the rights to serialize Ayesha, by H. Rider Haggard, a sequel to his popular novel She. Haggard's Lost World genre influenced several key pulp writers, including Edgar Rice Burroughs, Robert E. Howard, Talbot Mundy and Abraham Merritt. In 1907, the cover price rose to 15 cents and 30 pages were added to each issue; along with establishing a stable of authors for each magazine, this change proved successful and circulation began to approach that of Argosy. Street and Smith's next innovation was the introduction of specialized genre pulps, with each magazine focusing on a particular genre, such as detective stories, romance, etc.