What is 5-7-5 format in a poem mean?

The 5-7-5 format refers to a specific type of poem called a haiku. It's a traditional Japanese poetic form with a structure of:

* 5 syllables in the first line

* 7 syllables in the second line

* 5 syllables in the third line

Example:

* First line: (5 syllables) *Falling leaves flutter*

* Second line: (7 syllables) *A gentle breeze blows by*

* Third line: (5 syllables) *Autumn's touch arrives*

Haikus often focus on nature and everyday observations, often using imagery to evoke feelings and emotions. The short and concise structure allows for a strong impact with minimal words.