what is data Flashcards

1
Q

what is data?

A

it is the differences made in some substance by some actor that makes some difference

in the sense of informing some other actor

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2
Q

what do you need to make data?

A

a set of differences

if there is no variation then there is no data

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3
Q

how can data be coded?

A

coded to form symbols
such as a wavelength
tough could = 1
peak = 0

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4
Q

what is a data structure?

A

data can be coded and formed into physical symbols and formed into larger entities known as data structures

structures can be stored in some way

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5
Q

what can data structures do?

A

act as messages formed from symbols

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6
Q

what is a digital code?

A

digital code in which a signal can be sent is usually binary

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7
Q

what is a binary code?

A

0-1

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8
Q

what is meant by bits?

A

binary digits

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9
Q

what can all forms of coding be done in?

A

coding in bits

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10
Q

what is important about bits?

A

most fundamental way in which symbols can be formed as signals or data stores

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11
Q

what is the power of bots?

A

it is the basic difference between two things typically done in binary digits

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12
Q

what is capacity normally measured in?

A

bits

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13
Q

what is important about the medium>

A

the medium or substance in wchih data is made has an important bearing on the way in which structures are used

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14
Q

what does the differences in substances explain?

A

the way in which data structures as signals differ from data structures as records
e.g signals such as facial expression disappear shortly after

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15
Q

what does forming data with a persistence substance mean

A

it can be used to form data stores

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16
Q

what can data stores do?

A

be used by different actors across different times and location

17
Q

what does ubiquity mean?

A

presence everywhere

18
Q

why are data structures uquiquity?

A

they are present everywhere in different forms

such as physical and electronic

19
Q

what are data structures consisted of?

A

data elements which consists of data items

20
Q

in an electronic table which is a data element and which is a data item

A
elements = row 
items = column
21
Q

how do you form symbols?

A

binary digits strings have to be coded into larger structures

22
Q

what does data types declare?

A

how data should be used

23
Q

what is bytes?

A

measurement od data storage capacity

24
Q

what is a byte?

A

by 8, consists of 8 bits

25
Q

kilobyte?

A

103

26
Q

megabyte?

A

106

27
Q

gigabyte?

A

109

28
Q

terabyte?

A

1012

29
Q

petabyte

A

1015

30
Q

exabyte

A

1018

31
Q

zetayte

A

1021

32
Q

what is the importance of data structures?

A

important to organisations as much action is reliant upon data

33
Q

where are data structures articulated?

A

data systems

34
Q

what types of articulation occurs in a data system?

A

create
update
delete
read