Katakana is a Japanese syllabary, one component of the Japanese writing system along with hiragana, kanji and in some cases the Latin script.
Collection of poems by priest Myōe, 1248
In this travel warning, the kanji for "fog" (霧) has been written in katakana (キリ) to make it more immediately readable.
A page of the Meiji Constitution written exclusively with kyūjitai and katakana
Syougaku11
The modern Japanese writing system uses a combination of logographic kanji, which are adopted Chinese characters, and syllabic kana. Kana itself consists of a pair of syllabaries: hiragana, used primarily for native or naturalised Japanese words and grammatical elements; and katakana, used primarily for foreign words and names, loanwords, onomatopoeia, scientific names, and sometimes for emphasis. Almost all written Japanese sentences contain a mixture of kanji and kana. Because of this mixture of scripts, in addition to a large inventory of kanji characters, the Japanese writing system is considered to be one of the most complicated currently in use.
Japanese novel using kanji kana majiri bun (text with both kanji and kana), the most general orthography for modern Japanese. Ruby characters (or furigana) are also used for kanji words (in modern publications these would generally be omitted for well-known kanji). The text is in the traditional tategaki ("vertical writing") style; it is read down the columns and from right to left, like traditional Chinese. Published in 1908.
Yokogaki