general information

so as i said i will be posting about computers so here is a couple general information about them to get you started....

1.Basics of IT(information technology):
computers play a very important role in our life but have any of you ever
asked themselves what are computers? how do they work? no worries i'll
explain some of these questions to you and lets hope that i helped you :)

Computers are information processing machines used in different departments and organizations you can connect computer with each other from all around the world therefore it made sharing information much easier which caused more productivity and good quality with less costs and legal constrains.

Computers preform three main operations:
1.Receive input (data raw facts)
2.Process it according to predefined instructions
3.Produce output (information which is meaningful)

receive input: such as typed data or using a floppy disk or what ever to give the computer your input

process it: when you type anything or do anything with your computer lets say typing which is exactly what i am doing now...when you type the computer's CPU process all the data that is given to it into commands then gives it to you as an output so when i type lets say the word "hello" your computer process every button you press into commands then does that command which will make it give you the output which is the word hello that we typed...

2.Computer System:
the components of a computer system are:

1.Hardware:
physical components like : screens,mouse , keyboard ,printers, cables, scanners....etc
the hardware cannot do anything without the software

2.Software:
A set of instructions that tells the computer what to do and how to do it such as:
word processing , computer games etc...

3.users:
Are people who use the software on the computer to do some tasks without users computers cannot operate by themselves..

3.Information technology :

computer system is what information technology is all based on.
so what is information technology ?

IT(information technology ) is a set of tools that the helps us send, receive , store, retrieve , print ,and transmit information through computers in an electronic form... transmitting , printing , storing , sending and receiving data can be in many forms such as: music files , text files, document files, video files and much more....

4.Types of Computers:
According to their capacity and performance computers are classified into many categories :

1.Mainframes
2.mini computers
3.personal computers
4.laptops
5.palmtop computers
6.Network computers
7. Super computers

1.Mainframes:
they are very big computers room sized, expensive ,high speed very powerful
large storage capacities. theya re used in banks , government department
and large organizations they are connected to a large number of terminals that cannot operate on their own or to intelligent terminals that can operate on their own that have a processing power themselves that can be used by the user.

2.mini computers:
they do the same job as a mainframe but on a smaller scale.
they are used where personal computers are not appropriate

3.Personal computers:
can be set on a desk they are not expensive therefore they are very popular
PC's are manufactured under different names such as IBM compatible or a macintosh computer machintosh computers can only run systems that are made by Apple.

4.laptops :
i think every body knows what a laptop is so i wont go into that much
laptops are similar to a personal computer the only difference they have is that a laptop is portable and thats what makes it to expensive.

5.palmtops:
Also known as notepads they are really small computers that can do simple tasks they usually have a screen a small keyboard it is also possible to transfer data from a palmtop to a laptop or a PC. they are not to expensive either.

6.Network computers:
A large pc type computer called a SERVER is connected to smaller pc's that are called clients or terminals.
clients are monitors with a keyboard and a mouse and a small box which contains the CPU , main memory so basicly a client IS YOU! or any normal computer
a client downloads applications and data from the server into its main memory
any changes will be stored in the server

7.Super computers:
Computers with a a very high speed used in large scientific and research laboratories and such they cost millions and millions.

stay tuned for the next post to see what i will write about.