Astral projection is simply mental/spiritual travel out of the body to any place on the astral plane; the realm of dreams and spirits etc. It’s as easy as daydreaming, but full transfer of consciousness to the point where the experience is more real than normal waking reality takes practice. Below and at this link I give the process step by step. Here in pdf format http://horizonsmagazine.com/mags_online/Astral-Projection-Handbook.pdf — below is the text
Wikipedia:
Astral projection (or astral travel) is a type of out-of-body experience that assumes the existence of an “astral body” separate from the physical body and capable of traveling outside it. Astral projection is experienced as being “out of the body.” Astral projection, or astral travel, denotes the astral body or etheric double leaving the physical body to travel in the astral plane. The astral body is a body of light intermediate between, and uniting, the rational soul and the physical body. Individuals that are trained in the use of the astral vehicle can separate their consciousness in the astral vehicle from the physical body at will.