What is Noise in Communication? A broad definition of noise in communication is something that keeps a receiver from completely comprehending a message. Distractions can inhibit a person from offering his undivided attention and may keep him from fully grasping what you are trying to say.
The difference between FDM and PolyJet printing is that PolyJet printing will give you extremely smooth surfaces, complex geometrical structures and precision like never before. Another great advantage that comes with PolyJet printing is that you can use a number of materials in one single prototype.
The difference between a data flow diagram (DFD) and a flow chart (FC) are that a data flow diagram typically describes the data flow within a system and the flow chart usually describes the detailed logic of a business process. Other answers have gone over the basics of what each thing is.