The Ajna, or third eye chakra, is considered the sixth layer of our energetic system. Consider it something like your spiritual vision, helping you cut through the spiritual muck and see the world for what it really is. It exists in the center of your forehead. Some believe it can be physiologically traced to the pineal gland, which is a pea-sized conical mass of tissue behind the third ventricle of the brain responsible for secreting hormones in most mammals.
When opened, the chakra allows for heightened intuition, intelligence, and a higher guidance for our lives.
There are some things you can do to open this third eye chakra such as letting go of material things, leaving behind your fear of death, astral project, live a more spiritual life, and be more decisive.
You can also fill your life with lapis lazuli and amethyst stones, which amplify spiritual energy and receptivity.