The hyperlinks take you directly to the candidate profile within ENGAGE. They are a great tool for sharing profiles with colleagues, or for quick access from your ATS or CRM system. Since the export is text based csv, ENGAGE can't mark the hyperlinks as such.
To turn them to active hyperlinks within excel, use the excel =HYPERLINK(xx) function. Simply add a new column and use this function to turn the exported link to an actual hyperlink. After you do it on the first cell, copy the function down the column.
This short video maybe helpful (external content).