Here's a breakdown:
* Iambic: This refers to the rhythm of the line, which alternates between an unstressed syllable followed by a stressed syllable (da-DUM).
* Pentameter: This means there are five metrical feet (sets of unstressed and stressed syllables) per line, making a total of ten syllables.
So, a line of iambic pentameter looks like this:
da-DUM da-DUM da-DUM da-DUM da-DUM
For example:
"But, soft! What light through yonder window breaks?"
Shakespeare often used variations and deviations from strict iambic pentameter to create dramatic effects, but it remained the foundational rhythm of his plays.