<s>
Google	B-Application
Penguin	I-Application
was	O
a	O
codename	O
for	O
a	O
Google	B-Algorithm
algorithm	I-Algorithm
update	O
that	O
was	O
first	O
announced	O
on	O
April	O
24	O
,	O
2012	O
.	O
</s>
<s>
The	O
update	O
was	O
aimed	O
at	O
decreasing	O
search	B-Application
engine	I-Application
rankings	O
of	O
websites	O
that	O
violate	O
Google	O
's	O
Webmaster	O
Guidelines	O
by	O
using	O
now	O
declared	O
Grey	O
Hat	O
SEM	O
techniques	O
involved	O
in	O
increasing	O
artificially	O
the	O
ranking	O
of	O
a	O
webpage	O
by	O
manipulating	O
the	O
number	O
of	O
links	O
pointing	O
to	O
the	O
page	O
.	O
</s>
<s>
Allegedly	O
,	O
few	O
websites	O
lost	O
search	O
rankings	O
on	O
Google	O
for	O
specific	O
keywords	O
during	O
the	O
Panda	B-Application
and	O
Penguin	O
rollouts	O
.	O
</s>
<s>
Google	O
specifically	O
mentions	O
that	O
doorway	O
pages	O
,	O
which	O
are	O
only	O
built	O
to	O
attract	O
search	B-Application
engine	I-Application
traffic	O
,	O
are	O
against	O
their	O
webmaster	O
guidelines	O
.	O
</s>
<s>
Penguin	O
5	O
(	O
also	O
known	O
as	O
Penguin	O
2.1	O
)	O
was	O
released	O
on	O
October	O
4	O
,	O
2013	O
,	O
affected	O
around	O
1%	O
of	O
queries	O
,	O
and	O
has	O
been	O
the	O
most	O
recent	O
of	O
the	O
Google	B-Application
Penguin	I-Application
algorithm	O
updates	O
.	O
</s>
<s>
On	O
April	O
7	O
,	O
2015	O
,	O
Google	O
's	O
John	O
Mueller	O
said	O
in	O
a	O
Google+	O
hangout	O
that	O
both	O
Penguin	O
and	O
Panda	B-Application
"	O
currently	O
are	O
not	O
updating	O
the	O
data	O
regularly	O
"	O
and	O
that	O
updates	O
must	O
be	O
pushed	O
out	O
manually	O
.	O
</s>
<s>
The	O
strategic	O
goal	O
that	O
Panda	B-Application
,	O
Penguin	O
,	O
and	O
the	O
page	O
layout	O
update	O
share	O
is	O
to	O
display	O
higher	O
quality	O
websites	O
at	O
the	O
top	O
of	O
Google	O
's	O
search	B-Application
results	I-Application
.	O
</s>
<s>
The	O
main	O
target	O
of	O
Google	B-Application
Penguin	I-Application
is	O
spamdexing	O
(	O
including	O
link	O
bombing	O
)	O
.	O
</s>
<s>
On	O
September	O
23	O
,	O
2016	O
Google	O
announced	O
that	O
Google	B-Application
Penguin	I-Application
was	O
now	O
part	O
of	O
the	O
core	O
algorithm	O
meaning	O
that	O
it	O
updates	O
in	O
real	O
time	O
.	O
</s>
<s>
Also	O
,	O
Google	B-Application
Penguin	I-Application
4.0	O
is	O
more	O
granular	O
as	O
opposed	O
to	O
previous	O
updates	O
,	O
since	O
it	O
may	O
affect	O
a	O
website	O
on	O
a	O
URL-basis	O
as	O
opposed	O
to	O
always	O
affecting	O
a	O
whole	O
website	O
.	O
</s>
<s>
Two	O
days	O
after	O
the	O
Penguin	O
update	O
was	O
released	O
Google	O
prepared	O
a	O
feedback	O
form	O
,	O
designed	O
for	O
two	O
categories	O
of	O
users	O
:	O
those	O
who	O
want	O
to	O
report	O
web	O
spam	O
that	O
still	O
ranks	O
highly	O
after	O
the	O
search	B-Application
algorithm	I-Application
change	O
,	O
and	O
those	O
who	O
think	O
that	O
their	O
site	O
got	O
unfairly	O
hit	O
by	O
the	O
update	O
.	O
</s>
