What does rhythmic ostinato mean?

In music, an ostinato is a repeated musical phrase or motif. A rhythmic ostinato is an ostinato that emphasizes rhythm particularly. These can range from being very simple (in Baroque ground bass) to complex (Steve Reich's use of rhythmic patterns). Ostinatos are often used to create a sense of momentum and drive in music, and can also be used to add texture and interest. They can be used in any musical genre, from classical to rock to electronic.