Computer
A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalized sets of operations, called programs. These programs enable computers to perform an extremely wide range of tasks.
Computer Network
A computer network, or data network, is a digital telecommunications network which allows nodes to share resources. In computer networks, computing devices exchange data with each other using connections between nodes (data links.) These data links are established over cable media such as wires or optic cables, or wireless media such as WiFi.
Network
Network and networking may refer to:
Network Security
Network security consists of the policies and practices adopted to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Users choose or are assigned an ID and password or other authenticating information that allows them access to information and programs within their authority. Network security covers a variety of computer networks, both public and private, that are used in everyday jobs; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access. Network security is involved in organizations, enterprises, and other types of institutions. It does as its title explains: It secures the network, as well as protecting and overseeing operations being done. The most common and simple way of protecting a network resource is by assigning it a unique name and a corresponding password.
Security
Security is freedom from, or resilience against, potential harm (or other unwanted coercive change) from external forces. Beneficiaries (technically referents) of security may be persons and social groups, objects and institutions, ecosystems, and any other entity or phenomenon vulnerable to unwanted change by its environment.
Security
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.
Helen Keller, The Open Door (1957). This quotation is often contracted into: Security is mostly a superstition... Life is either a daring adventure, or nothing. or paraphrased: Life is either a daring adventure or nothing at all.
Security
But why should there be an exception relative to security? What special reason is there that the production of security cannot be relegated to free competition? Why should it be subjected to a different principle and organized according to a different system?
Gustave de Molinari, tr. J. Huston McCulloch, §II of The Production of Security (Auburn, AL: Ludwig von Mises Institute, 2009; orig. 1849), p. 24.
Security
There is no security on this earth; there is only opportunity.
Attributed to Douglas MacArthur; reported in James B. Simpson, Contemporary Quotations (1964), p. 316; reported as unverified in Respectfully Quoted: A Dictionary of Quotations (1989).
EN 
CS
DE
ES
FR
HU
IT
PL
PT
РУ
SK
TR
УК
AR
中文
