<s>
X-Ray	B-Library
is	O
a	O
reference	O
tool	O
,	O
introduced	O
in	O
September	O
2011	O
,	O
that	O
is	O
incorporated	O
in	O
the	B-General_Concept
Amazon	I-General_Concept
Kindle	I-General_Concept
Touch	O
and	O
later	O
models	O
,	O
Kindle	B-Application
Fire	I-Application
tablets	O
,	O
Kindle	O
apps	O
for	O
mobile	O
platforms	O
,	O
Fire	B-Application
Phones	I-Application
,	O
and	O
Fire	B-Application
TVs	I-Application
.	O
</s>
<s>
General	O
reference	O
information	O
is	O
preloaded	O
into	O
a	O
small	O
file	O
on	O
the	B-General_Concept
Kindle	I-General_Concept
device	O
or	O
app	O
,	O
so	O
that	O
when	O
the	O
feature	O
is	O
used	O
,	O
there	O
is	O
no	O
need	O
to	O
access	O
the	O
Internet	O
to	O
access	O
such	O
content	O
as	O
dictionary	O
,	O
encyclopedic	O
,	O
or	O
metadata	O
entries	O
,	O
or	O
information	O
about	O
actors	O
featured	O
in	O
a	O
film	O
.	O
</s>
<s>
X-Ray	B-Library
lets	O
users	O
explore	O
in	O
more	O
depth	O
the	O
contents	O
of	O
a	O
book	O
.	O
</s>
<s>
As	O
Amazon	O
describes	O
:	O
"	O
X-Ray	B-Library
lets	O
you	O
explore	O
the	O
'	O
bones	O
of	O
a	O
book.	O
'	O
</s>
<s>
You	O
can	O
also	O
view	O
more	O
detailed	O
information	O
from	O
Wikipedia	O
and	O
from	O
Shelfari	B-Library
,	O
Amazon	O
's	O
community-powered	O
encyclopedia	O
for	O
book	O
lovers.	O
"	O
</s>
<s>
After	O
Shelfari	B-Library
closed	O
in	O
2016	O
,	O
information	O
from	O
Goodreads	B-Application
was	O
displayed	O
in	O
the	O
X-Ray	B-Library
tool	O
.	O
</s>
<s>
X-Ray	B-Library
operates	O
like	O
a	O
concordance	O
,	O
listing	O
most	O
commonly	O
used	O
character	O
names	O
,	O
locations	O
,	O
themes	O
,	O
or	O
ideas	O
,	O
which	O
are	O
sorted	O
into	O
the	O
two	O
main	O
categories	O
of	O
"	O
People	O
"	O
and	O
"	O
Terms	O
"	O
.	O
</s>
