Blank verse is a special type of non-rhyming poem. The poem is written in iambic pentameter. Iambic pentameter describes the way Shakespeare wrote, so you are probably familiar with the rhythm. It is described as the most common pattern to remember, and even as sounding like a heartbeat.
Blank verse consists of lines with ten syllables, and the accent or emphasis is on the even numbered syllables.
Consider the first line.
The buzz saw snarled and rattled in the yard (1)
The (1) buzz (1) saw (1) snarled (1) and (1) rattled (2) in (1) the (1) yard (1).
The syllables are marked next to the words, and you can see that the even words are emphasized. The next line has 10 words, and 10 syllables. The next line does not rhyme, and in fact none of the lines rhyme.