Often viewed as a type of input information for an organism or designed device. There are two types of inputs. Some inputs are important for the function of the organism (eg food) or device (energy) by themselves. In his book Sensory Ecology, Dusenbery called these causal inputs. Other inputs (information) is important only because they are associated with causal inputs and can be used to predict the occurrence of a causal input at a later time (and perhaps elsewhere). Some important information because of its relationship with other information but eventually there must be a causal relationship to go. In practice, this information is usually carried by weak stimuli that must be detected by specialized sensory systems and amplified by energy inputs before they can function for the organism or device. For example, light is often a causal input to plants but provides information to the beast. colored light reflected from the flower is too weak to do much photosynthetic work but the visual system of bees bee nervous system detects and uses the information to guide bees to the flowers, where bees often find honey or pollen, causal inputs, serving a nutritional function.
In 2003, JD Bekenstein claimed there is a growing trend in physics to define the physical world is made of the information itself (and thus information is defined in this way) (see Digital physics). Information has a well defined meaning in physics. Examples include the attachment of quantum phenomena in which particles can interact without reference to their separation or the speed of light. Information itself can not travel faster than light even if the information sent indirectly. This could lead to the fact that all the physical effort with the relationship observed particle “entangled” the other is slowing, although the particles are not connected in any way other than with the information they carry.
Another shown by Maxwell’s demon thought experiment. In this study, a direct relationship between information and other physical properties, entropy, is shown. A consequence is that it is impossible to destroy information without increasing the entropy of a system, in practical terms this often means generating heat. Others, more philosophically, the result is information that can be regarded as interchangeable with energy. Thus, in the study of logic gates, the theoretical lower limit of the heat energy released by an AND gate is higher than for the NOT gate (because information was destroyed in an AND gate and simply converted in a NOT gate). physical information is important in the theory of quantum computers.