The Noble Eightfold Path describes the way to the end of suffering, as it was laid out by Siddhartha Gautama. It is a practical guideline to ethical and mental development with the goal of freeing the individual from attachments and delusions; and it finally leads to understanding the truth about all things. Together with the Four Noble Truths it constitutes the gist of Buddhism. Great emphasis is put on the practical aspect, because it is only through practice that one can attain a higher level of existence and finally reach Nirvana. The eight aspects of the path are not to be understood as a sequence of single steps, instead they are highly interdependent principles that have to be seen in relationship with each other. http://www.thebigview.com/buddhism/eightfoldpath.html is a great site for an explanation.