An iambic pentameter is a meter used in poetry. It also used in drama as well. It is descriptive of rhythm that make up each line. Rhythm is measured in syllables and these syllables are called feet. Pentameter means that there is five feet.
Iambic pentameter is very common in english poetry and drama. William Shakespeare used a lot of it in his sonnets.
Here is an example of an iambic pentameter:
Is this a dagger I see before me?
Here is how is split up:
Is this / a dag- / ger I / see be- / fore me?
Notice that each set contains two syllables. One in stressed and one is unstressed.