What Is a Haiku?

A haiku is a brief, unrhymed poem, traditionally rooted in a specific, observed moment — most often something in nature or the natural world. In Japanese, it's built from 17 on (sound units) arranged 5-7-5. In English, the form is usually approximated as three lines, though — as this page explains — that's a convention, not a strict requirement.

What actually defines a haiku isn't primarily the syllable count. It's the combination of brevity, a concrete image (rather than an abstract statement), and often a cut — a juxtaposition between two parts of the poem that creates meaning in the space between them, rather than spelling it out.

Haiku developed out of hokku, the opening stanza of a longer collaborative Japanese poetic form called renga. The hokku set the scene and season for the poem that followed, which meant it had to work as a self-contained image. Over time, poets — most famously Matsuo Bashō in the 17th century — began writing hokku as standalone poems in their own right. The term "haiku" itself wasn't widely used until the late 19th century, popularized by the poet and critic Masaoka Shiki, who also helped distinguish haiku from its more comedic cousin, senryu.

English-language haiku emerged in the 20th century as translators and poets encountered the Japanese form and adapted it — not always literally — into English. That adaptation is why English haiku conventions (like the 5-7-5 line pattern) are an approximation of the Japanese original rather than an exact match.

• Brevity — a small number of words, no wasted language.
• A concrete image — something observed, not an abstract idea stated directly.
• Present-moment awareness — haiku usually captures a single instant, not a narrated sequence.
• A seasonal reference (kigo) — traditional, though optional in modern practice. See What Is Kigo?
• A cut (kireji) — a pause or juxtaposition between two parts of the poem. See What Is Kireji?

The biggest source of confusion around haiku is the syllable count. Japanese haiku are counted in on, a unit of sound that doesn't correspond one-to-one with an English syllable — so a faithful translation of a 17-on Japanese haiku often doesn't total 17 English syllables at all. For the full explanation, with a worked example, see Does a Haiku Have to Be 5-7-5?

This is the standard English translation of Bashō's most famous haiku. Notice what it does: one setting (an old pond), one action (a frog jumping in), and one resulting sensory detail (the sound). Nothing is explained or commented on — the poem simply presents the moment and lets the reader arrive at the rest.