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Fog Computing is a model where data, processing, and applications are concentrated in devices at the network edge rather than being stored almost entirely in the cloud. It is an extension of Cloud Computing, proposed by Cisco. The name comes from the saying that “fog is the cloud that is closer to the ground”.
Fog Computing, like Cloud Computing, is very illustrative. The cloud floats high in the sky, abstract and unreachable; while fog is tangible, closer to the ground, right beside us. Fog Computing is not composed of powerful servers, but rather consists of weaker, more distributed functional computers that infiltrate various items in factories, cars, appliances, streetlights, and people’s material lives.
Fog Computing is an extension of the cloud computing concept, addressing the weaknesses of cloud computing mentioned above. Moreover, it primarily utilizes devices in edge networks, providing data transfer with extremely low latency. Fog Computing has a vast geographic distribution, with large-scale sensor networks containing numerous network nodes. It supports good mobility, allowing mobile phones and other devices to communicate directly with each other without needing to go to the cloud or base stations, supporting high mobility.
Cloud Computing
Fog Computing is not made up of powerful servers; it consists of weaker, more distributed functional computers. Fog Computing lies between cloud computing and personal computing, representing a semi-virtualized service computing architecture model emphasizing quantity. Regardless of how weak each computing node’s capability is, it must play a role. Compared to cloud computing, Fog Computing adopts a more distributed architecture, closer to the network edge. Fog Computing concentrates data, data processing, and applications in devices at the network edge, rather than storing them almost entirely in the cloud, relying more on local devices for data storage and processing rather than servers. Fog Computing is a new generation of distributed computing that aligns with the internet’s “decentralized” characteristics. Since Cisco proposed Fog Computing, major tech companies such as ARM, Dell, Intel, Microsoft, and Princeton University have joined this conceptual camp, establishing a non-profit organization called the Open Fog Consortium, aimed at promoting and accelerating the adoption of open fog computing and facilitating the development of the Internet of Things. Fog Computing mainly consists of personal clouds, private clouds, and enterprise clouds. [1]
Fog Computing is entirely different from Cloud Computing. Cloud Computing primarily relies on IT operators and public cloud services. Fog Computing wins by quantity, emphasizing that regardless of how weak each computing node’s capability is, it must play a role. Cloud Computing emphasizes overall computational power, typically accomplished by a set of centralized high-performance computing devices. Fog Computing expands the network computing model of Cloud Computing, extending network computing from the center to the edge, thus being more widely applicable to various services. Fog Computing has several distinct features: low latency and location awareness, broader geographic distribution, adaptability to mobile applications, and support for more edge nodes. These features make mobile business deployment more convenient, meeting broader node access needs. [2]