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| what your web browser interprets, for example, as a facebook page |
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| info processing and storage occurs using a symbolic representation of the data. Process and store info as a discrete pattern of electrical charges |
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| a fact pattern, for example 1 and 0 |
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example: iPod, questionably abacus, laptop, Mac, PC,
--takes an input (some data), applies a process and produces an output (information) |
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| info is processed directly in its indigenous form. |
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| using a limitted set of symbols to represent any original text/info |
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| the ability to give a general-purpose computer instructions so it can perform new tasks |
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| the physical components such as the monitor, keyboard,and hard drive. |
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| the programs that execute on the computer, carrying out tasks such as word processing |
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| three parts: input/output devices, memory, programs. |
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| allow the user to communicate with the computer by entering commands and then viewing the results. |
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| stores info for the computer by process |
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| instructions specifying the steps necessary to complete specific tasks. |
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| central processing unit; carries out programmatic in order to process data. |
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| collections of wires that carry info in form of electrical signals |
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| computers that use the von Neuman architecture. |
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1; fetchin program instructions for memory
2; executing those instructions |
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system of interlinked hypertext documents and other resources, like images, accessed via the internet
conceived by Tim Berners-Lee, 1989 |
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standard way of specifying the location of a resource, its name and how to get it
ex: http://www.bu.edu/studentlink |
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1. browser decodes URL to parse out host name and doc location
2. browser makes network connection to server
3. client requests resource and waits for the server to respond (using hypertext transfer protocol)
4. browser parses response, reqests any embedded data and formats/displays output |
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a standard way of doing something
HTTP= hyper text transfer protocol
specifies how to request and deliver content, like webpages |
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specifies requests and responses between clients and servers
builds upon
1. the internet exists/is connected
2. reliable transport of data
3. web servers are waiting to service clients
* not linked to webpages, can transfer any data |
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hyper text markup language
uses tags to annotate info in a doc. |
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the specific elements in a markup language
that indicate how info should be displayed |
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a named collection of related data, used for organising secondary storage
ie, floppy disk |
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named group of files
aka a folder |
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aka filename
logical name used to ID a location in a file system |
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| a logical view of the nested directory organisation of a file system. each dir. is a branch, each file a leaf. |
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| directory at highest level from which all other branches descend |
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| every dir. has a parent right up to the root |
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| a path that begins at the root and includes all successive subdirectories |
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| present working directory |
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| default/current path being used by the user |
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| a path that begins at present working directory |
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| describes the KIND of info in a file |
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part of a file that indicates the type of file you have
ex: filename.extension
turtle.jpg |
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| set of rows of data, each of which has a number of fields |
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an application of software which waits for/responds to HTTP requests
WWW or HTTPd |
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| roles: processing HTTP, logging, delivering static content from file system, running scripts to deliver dynamic content |
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--receives http request
--searches for source (file) on disk
--sends HTTP responce (source code+data)
404= not found
403= forbidden |
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