Difference between single and double slash in Xpath

Answer:
 /

1.  start selection from the document node
2. allows you to create 'absolute' path expressions
3. e.g. “/html/body/p” matches all the paragraph elements

 //

1.  start selection matching anywhere in the docume
2. allows you to create 'relative' path expressions
3. e.g. “//p” matches all the paragraph elements