Enables the effective storage of data in a structured and logical way
Can be computerised od paper-based
used to describle any collection of data
large collection of data items and links
between them which are structured in a way
that allows it to be accessed by a number of
different applications
HTML
Hyper Text Markup Language
File containing text that uses tags to say how it should be displayed
Includes the location of the URL of
other elements like images, sounds
and videos to be included as well as
hyperlinks to other web pages.
Made out of up of a series of tags that tell the
web browser how to display the text and
image on a web page
Networks
LAN
Local Area Network
Network of computers connected in a limited area
usually the same building or
nearby buildings
High speed
WAN
Wide Area Network
Joins computers
together over a long
distance
Can be joined using
oublic telephones, fibre
optic cables, or satellites
etc
Built for a particular company but they are private
Bus
Set of wires which transfer
data or power between
components inside the
computer
A bus cannot connect peripherals together
BUS CLOCK: while the CPU is busy cycling
throughits, program, data is being moved
around the computer by means of data
buses
Each of these buses are also running with their
own clocks, each time the clock 'pulses' a data
transfer can take place.
Star Network
Type of network arrangement where each
computed is linked to a central server on a
dedicated line
Arrangement looks like a star with one server in the middle
and all the computers surrounding it with one connection
Advantage: each lunk to the server is independent of the
other computers so the comouter do not have to share
bandwidth with eachother
Disadvantage: more cabell]ng is needed + if the
central server is borken the whole system is broken
Ring Network
Where one computer is
linked to the next and
the last computer is
linked to the firstn
forming a ring shaped
network
Simple to set up
useful for small office networks
if one of the links is broken
then one side of the
cmputers break can't
communiate with the other
side
Types of software
Custom Written software: created specifically
for the user, it is expensive ( as you have to pay
someone to make it) but is often used when the
application is very specific or unique so no
alternative software is availiable
Off the shelf software: suitable for a wide
range of users (like a work processor) it is
cheaper than Bespoke software and
availiable instantly but will come with lots
of functionality you dont need and not
everything you like
Open source software: has a source code
open to the public, so anyone can add new
features to improve the existing code. It is
usually free and created by a huge
community of programmers who can
distribute their own version of the program.
Proprietary Software:
created by companies
and sold for profit,
users cant get access to
the source code and
must wait for the
company tofix any
bugs.