Prometheus played a trick on Zeus and offered him two offerings. The first offering disguised the finest cuts of beef, the second disguised the bones and fat. The second one looked more appealing so that is the one he took. After that day humans would keep the edible parts and burn the inedible things.
This angered Zeus and as a punishment he took away the fire. without fire mankind could do noting so Promethius did another trick and stole back the fire to bring to earth to save mankind.
Once again this angered Zeus So he decided to create Pandora as punishment to mankind.
Zeus got help from all the Gods to create Pandora. Each God or Goddess gave pandora certain characteristics and physical atribute to help tempt Prometheus' brother Epimethius. Zeus gave pandora a Jar to open when she came to earth full of evil things.
Zeus gave Pandora to Epimethius even though Promethius told Epimethius never to accept a gift from Zeus. Epimethius then married Pandora.
Upon arriving on Earth Pandora Opened the jar letting out all the evils but leaving hope left inside. This made the world which was once peaceful and without evil no longer only good.