Ever take a picture and when it's developed, a bunch of semi-transparent balls show up on it? Well those are called orbs. By a dictionary definition, orbs mean a spherical object. But in a paranormal sense, it's not that simple or straightforward.
Some think that orbs are the spirits themselves, appearing in a globular, semi-transparent shape. But some other think that it's not the spirits themselves. Rather, it's the transfer of energy from various sources. See, spirits need energy in order to manifest themselves. They draw energy from battery, electrical lines, people, etc. This theory ties in with a Physics theory which says that energy being transfered in such fashion would take a spherical shape. It also ties in with a high EMF (Electro Magnetic Field) reading in areas where the spirit activity is supposedly active. (http://theshadowlands.net/ghost/orbs.htm)
Not everybody believes that orbs are phenomenon of paranormal nature, that's for sure. And they're not of paranormal nature all the time, anyway. At times, it could be a reflection of a light, dust, dirty lens, precipitation, etc.
One time, I was just going around taking pictures of my neighborhood with my old 4.0 megapixels digi-cam. I got to this street corner of this fancy part of the hood and my camera started acting funny. Through the lens, it looked like there was this big pink blur right in front of me (it was so close, it was literally in my face). When I took the picture, there was nothing there. Then later I remember that when I used to take my dog for a walk, he used to get scared when we get to that area. So scared, that he wouldn't even walk and I had to carry him. Was it just a technical glitch or someone or something was getting curious of me? Hmmm......
