Cloud computing is the on-demand
availability of computer system resources, especially data
storage and computing power, without direct active management by the
user. The term is generally used to describe data centers available
to many users over the Internet. Large clouds, predominant today, often
have functions distributed over multiple locations from central servers.
If the connection to the user is relatively close, it may be designated
an edge server.
Clouds
may be limited to a single organization (enterprise clouds), or be
available to many organizations (public cloud).
Cloud
computing relies on sharing of resources to achieve coherence and economies
of scale.
Advocates
of public and hybrid clouds note that cloud computing allows companies to avoid
or minimize up-front IT infrastructure costs. Proponents also claim
that cloud computing allows enterprises to get their applications up
and running faster, with improved manageability and less maintenance, and that
it enables IT teams to more rapidly adjust resources to meet fluctuating and
unpredictable demand, providing the burst computing capability:
high computing power at certain periods of peak demand
Cloud
providers typically use a "pay-as-you-go" model, which can lead to
unexpected operating expenses if administrators are not
familiarized with cloud-pricing models.
The
availability of high-capacity networks, low-cost computers and storage devices
as well as the widespread adoption of hardware virtualization, service-oriented
architecture and autonomic and utility computing has
led to growth in cloud computing. By 2019, Linux was the most widely
used operating system, including in Microsoft's offerings and is thus
described as dominant. The Cloud Service Provider (CSP) will screen, keep up
and gather data about the firewalls, intrusion identification or/and
counteractive action frameworks and information stream inside the network
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