Bounce rate is literally the number of single page visits (web sessions)of your audience without digging down to the next page. it is of vital importance that the entrant page ( and of course the consecutive pages)has got all the flavors and aspects of whats is made for!!
When a bounce rate is higher, you should be worried.. It means that the audience are either not satisfied with what you provided on the entrant page or it is not relevant to what they are looking for!!If you are not providing the relevant information on your site, it is very unlikely that you can transform visitors to leads