Computer science question
1.write all the data terms
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Answers
Answer:
internet, world wibe web
The Internet is the network of computers we’re all familiar with. It’s quite common for the terms “Internet” and “World Wide Web” to be used interchangeably, but these aren’t actually the same thing. The Internet is essentially the wiring that allows computers all over the world to communicate. The World Wide Web is a system that operates via this wiring. Web pages are transmitted via Internet connections but there is more to the Internet than just the web. Many other types of data travel across the Internet too, for example email
web browse
The Internet is the network of computers we’re all familiar with. It’s quite common for the terms “Internet” and “World Wide Web” to be used interchangeably, but these aren’t actually the same thing. The Internet is essentially the wiring that allows computers all over the world to communicate. The World Wide Web is a system that operates via this wiring. Web pages are transmitted via Internet connections but there is more to the Internet than just the web. Many other types of data travel across the Internet too, for example email.
Bandwidth, Broadband
Bandwidth is an indication of how quickly data travels along a connection. The greater the bandwidth, the faster data will be sent and received. Broadband is a rather vague term that refers to bandwidth somewhere above that of an old dial-up modem, although there is no precise definition of the term. Broadband connections are generally “always on”, unlike modem connections. There are various technologies which provide “broadband” speeds – such as ADSL, cable, satellite etc.
Modem
The word modem was originally coined in the days when computers communicated by converting numbers into sounds that could then be transmitted over a regular telephone line. At each end you needed a “modulator” to generate the sounds to transmit and a “demodulator” to convert received sounds back into numbers. From “MOdulator/DEModulator” came the word modem.
With modern digital communication, no conversion to and from audible sounds is required, but even so it’s common to hear people talking about “broadband modems” or “ADSL modems” when referring to devices providing broadband connectivity. Strictly speaking, such devices are not modems at all as they communicate digitally but the word has stuck; its meaning has shifted to refer to digital devices as well
Memory, Disk Space
Another very common source of confusion. In computing, “memory” generally refers to the temporary storage used by a computer whilst it is switched on. A computer loads programs and data into its memory in order to carry out tasks. This is more accurately called RAM or “random-access memory”. Disk space (or “hard disk space”), on the other hand, is a more permanent store that holds files even when the computer is switched off. It’s from here that the computer loads things into its memory. Strictly speaking you don’t store things in the computer’s memory as that vanishes when you turn the machine off.
Bits, Bytes
At a basic level, all computer data is just a series of 0s and 1s. Each of these is referred to as a “binary digit”, for which “bit” is just an abbreviation. A byte is (generally) a collection of eight bits, so called because of the pun with bit and bite. Similarly a collection of four bits – half a byte – is sometimes called a “nybble”.
In order to refer to large numbers of bits and bytes, various prefixes are used, as in :
1 kilobyte = 1024 (or 1000) bytes
1 megabayte = 1024 (or 1000) kilobytes
1 gigabyte = 1024 (or 1000) megabytes
1 terabyte = 1024 (or 1000) gigabytes
1 petabyte = 1024 (or 1000) terabytes
Cookie
A small text file sent to your computer by a web site you have visited. These can be very useful in that they can allow the web site to recognize who you are when you return. Cookies cannot store viruses or other threats, although they can be used to track your activity across different web sites in order to provide, for example, “targeted” advertisements.
Firewall
A firewall is a piece of computer software or hardware that restricts the data that is allowed to flow through. Firewalls block traffic that is undesirable in some way, the intention being to prevent infection by malware and so on without restricting the user from carrying out legitimate activity.
Spam
Unsolicited email messages sent out in bulk and generally commercial in nature. In fact the term is used more widely these days to refer to such messages in a variety of places, not just on email – for example comments on blogs.
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