<s>
Amazon	B-Protocol
Silk	I-Protocol
is	O
a	O
web	B-Application
browser	I-Application
developed	O
by	O
Amazon	B-Application
.	O
</s>
<s>
It	O
was	O
launched	O
in	O
November	O
2011	O
for	O
Kindle	B-Application
Fire	I-Application
and	O
Fire	B-Application
Phone	I-Application
,	O
and	O
a	O
Fire	B-Application
TV	I-Application
version	O
was	O
launched	O
in	O
November	O
2017	O
.	O
</s>
<s>
The	O
addition	O
of	O
Silk	O
to	O
the	O
Echo	B-Device
Show	I-Device
was	O
announced	O
at	O
an	O
Amazon	B-Application
event	O
in	O
September	O
2018	O
.	O
</s>
<s>
The	O
browser	B-Application
uses	O
a	O
split	O
architecture	O
where	O
some	O
of	O
the	O
processing	O
is	O
performed	O
on	O
Amazon	B-Application
's	O
servers	O
to	O
improve	O
webpage	O
loading	O
performance	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
open	B-Application
source	I-Application
Chromium	B-Language
project	I-Language
that	O
uses	O
the	O
Blink	B-Language
and	O
V8	B-Language
engines	O
.	O
</s>
<s>
For	O
each	O
webpage	O
,	O
Silk	O
decides	O
which	O
browser	B-Application
subsystems	O
(	O
networking	O
,	O
HTML	O
or	O
page	O
rendering	O
)	O
to	O
run	O
locally	O
on	O
the	O
device	O
and	O
which	O
to	O
run	O
remotely	O
on	O
its	O
own	O
Amazon	B-General_Concept
EC2	I-General_Concept
servers	O
.	O
</s>
<s>
Silk	O
uses	O
Google	B-Application
's	O
SPDY	B-Protocol
protocol	O
to	O
speed	O
up	O
loading	O
of	O
web	O
pages	O
.	O
</s>
<s>
Silk	O
gives	O
SPDY	B-Protocol
performance	O
improvements	O
for	O
non-SPDY	O
optimized	O
websites	O
if	O
the	O
pages	O
are	O
sent	O
through	O
Amazon	B-Application
's	O
servers	O
.	O
</s>
<s>
Some	O
privacy	O
organizations	O
raised	O
concerns	O
with	O
how	O
Amazon	B-Application
passes	O
Silk	O
traffic	O
via	O
its	O
servers	O
,	O
effectively	O
operating	O
as	O
an	O
Internet	O
service	O
provider	O
for	O
those	O
using	O
the	O
browser	B-Application
.	O
</s>
<s>
The	O
Silk	B-Protocol
browser	I-Protocol
includes	O
the	O
option	O
to	O
turn	O
off	O
Amazon	B-Application
server-side	O
processing	O
.	O
</s>
<s>
On	O
July	O
26	O
,	O
2016	O
it	O
was	O
reported	O
that	O
Silk	O
prevents	O
access	O
to	O
Google	B-Application
over	O
HTTPS	B-Protocol
,	O
but	O
that	O
bug	O
has	O
since	O
been	O
fixed	O
.	O
</s>
<s>
Amazon	B-Application
says	O
"	O
a	O
thread	O
of	O
silk	O
is	O
an	O
invisible	O
yet	O
incredibly	O
strong	O
connection	O
between	O
two	O
different	O
things	O
"	O
,	O
and	O
thus	O
calls	O
the	O
browser	B-Application
Amazon	B-Protocol
Silk	I-Protocol
as	O
it	O
is	O
the	O
connection	O
between	O
Kindle	B-Application
Fire	I-Application
and	O
Amazon	B-Application
's	O
EC2	O
servers	O
.	O
</s>
