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Disease means without ease or discomfort. The term disease broadly
refers to any condition that impairs normal function. Commonly, this term is
used to refer specifically to infectious diseases, which are clinically
evident diseases that result from the presence of pathogenic microbial
agents, including viruses, bacteria, fungi, protozoa, multi cellular organisms,
and aberrant proteins known as prions. An infection that does not and
will not produce clinically evident impairment of normal functioning, such as
the presence of the normal bacteria and yeasts in the gut, is not
considered a disease; by contrast, an infection that is asymptomatic during its incubation
period, but expected to produce symptoms later, is usually considered a
disease. Non-infectious diseases are all other diseases, including
most forms of cancer, heart disease, and genetic disease.
A computer is
a programmable machine designed to successively and
automatically carry out a sequence of arithmetic or logical operations. The
particular sequence of operations can be changed readily, allowing the computer
to solve more than one kind of problem. An important class of computer function
on some computing podium is the accommodating of input from human operators and
the output of results formatted for human consumption. The crossing point
between the computer and the human operator is known as the user interface.
Predictably a computer consists of some form
of memory, at least one element that holds out arithmetic and logic
operations, and a sequencing and control unit that can change the order of
operations based on the information that is stored. Peripheral devices allow
information to be entered from an outer source, and allow the outcome of
operations to be sent out.
processing unit implements series of commands that make it read, maneuver and
then store data. Conditional instructions change the sequence of
instructions as a function of the existing state of the machine or its upbringing.
electronic digital computers were developed in the mid-20th century
(1940–1945). Initially, they were the size of a large room, overriding as much
power as several hundred modern personal computers (PCs). In this era
mechanical analog computers were used for military purposes.