What is the significance of lighting Akhand Jyoti during Navratri?

One of the most significant rituals during Navratri is the lighting of the Akhand Jyoti (eternal lamp). Under this ritual, devotees keep the holy flame lit for nine-ten days on the trot without letting it extinguish. Lighting Akhanda Jyoti is considered a symbol of driving away darkness from life. There're temples where Akhand Jyoti has continuously been lit for years.