The Internet of Things (IoT) is a computing concept that describes a future where everyday physical objects will be connected to the Internet and will be able to identify themselves to other devices. The term is closely identified with RFID as the method of communication, although it could also include other sensor technologies, other wireless technologies, QR codes, etc.
IoT is significant because an object that can represent itself digitally becomes something greater than when the object existed by itself. No longer does the object relate just to you, but now it is connected to objects around it, data from a database, etc. When many objects act in unison, they are referred to as having "ambient intelligence."
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Defect density is a software testing and quality assurance method used to find the intensity and concentration of logical flaws in a software program, component or product. It refers to the ratio of functional or technical defects found in software or components related to the entire software application over a certain period.