Chakras are energy centres in the human body, which helps us connect with the cosmic energy. Chakra is a Sanskrit term meaning Wheel, which represent energy point. There are seven main energy centres or Chakras in human body. These chakras can be invoked by practising meditation.

Meditation is the powerful tool which has the potential to connect you with the infinite cosmic energy. Once you connect with the cosmic energy, your chakras are invoked and starts radiating infinite energy in you. And when you practise more and more meditation your chakras starts getting perfected. And, as a result you start controlling your own life. You'll have infinite resources on your command to solve issues or problems of your life, your community, your country... and you become the leader among the men.
Every one of us have these seven energy points located in our body and every energy point is associated with a specific color, a specific sound frequency and specific human emotions and feelings. To find put details of the location of these chkras in our body and associated color and significance, please visit learningmeditation.com chakra page. Scientists are doing research from decades on the low frequency audio sounds which helps invoke these chakras. You can buy and download these audios online.
The energy invocation starts from the lower chakra to the higher chakra on the top of your head. This is the time when you have reached higher state of consciousness and you are on path of enlightenment. Pictorially this journey to invoke chakras is shown using two snakes moving in spiral shape (like human DNA) from bottom chakra to top chakra.
Audios to activate your Chakras:
Visit crystalinks.com website to understand Chakras in greater detail.