<s>
The	O
company	O
develops	O
cleaning	O
and	O
optimisation	O
tools	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
macOS	B-Application
and	O
Android	B-Application
operating	I-Application
systems	I-Application
,	O
including	O
CCleaner	B-Application
,	O
CCleaner	B-Protocol
Browser	I-Protocol
,	O
Defraggler	B-Application
,	O
Recuva	B-Application
and	O
Speccy	B-Application
.	O
</s>
<s>
On	O
22	O
September	O
2015	O
,	O
Piriform	O
launched	O
CCleaner	B-Application
Cloud	O
,	O
a	O
tool	O
to	O
maintain	O
computers	O
remotely	O
.	O
</s>
<s>
The	O
name	O
Piriform	O
means	O
"	O
shaped	O
like	O
a	O
pear	B-Application
,	O
"	O
possibly	O
referring	O
to	O
the	O
British	O
slang	O
"	O
to	O
go	O
pear-shaped	O
"	O
.	O
</s>
<s>
CCleaner	B-Application
was	O
launched	O
in	O
2004	O
by	O
founders	O
Guy	O
Saner	O
and	O
Lindsey	O
Whelan	O
.	O
</s>
<s>
In	O
September	O
2017	O
,	O
researchers	O
discovered	O
that	O
CCleaner	B-Application
was	O
compromised	O
by	O
hackers	O
who	O
inserted	O
a	O
backdoor	O
into	O
the	B-Application
software	I-Application
,	O
enabling	O
remote	O
access	O
to	O
infected	O
machines	O
.	O
</s>
<s>
The	O
malware	O
was	O
in	O
version	O
5.33	O
of	O
CCleaner	B-Application
,	O
prior	O
to	O
the	O
acquisition	O
by	O
Avast	O
.	O
</s>
<s>
CCleaner	B-Application
is	O
a	O
computer	O
cleaning	O
software	O
featuring	O
MacOS	B-Application
and	O
Windows	O
versions	O
.	O
</s>
<s>
CCleaner	B-Application
has	O
the	O
option	O
to	O
clean	O
computer	O
browser	B-Application
software	O
including	O
Microsoft	B-Application
Edge	I-Application
,	O
Internet	B-Application
Explorer	I-Application
,	O
Google	B-Application
Chrome	I-Application
,	O
and	O
Firefox	B-Application
as	O
well	O
as	O
a	O
computer	O
system	O
's	O
temporary	O
files	O
.	O
</s>
<s>
It	O
has	O
a	O
separate	O
tab	O
to	O
clean	O
the	O
registry	B-Protocol
.	O
</s>
<s>
(	O
A	O
potential	O
backup	O
of	O
regedit	B-Protocol
is	O
available	O
.	O
)	O
</s>
<s>
CCleaner	B-Application
's	O
other	O
tools	O
include	O
editing	O
and	O
uninstalling	O
programs	O
,	O
editing	O
the	O
operating	B-General_Concept
system	I-General_Concept
's	O
startup	O
apps	O
and	O
editing	O
browser	B-Protocol
plugins	I-Protocol
.	O
</s>
<s>
It	O
can	O
analyse	O
hard	B-Device
disks	I-Device
individually	O
to	O
determine	O
which	O
files	O
are	O
taking	O
the	O
most	O
space	O
.	O
</s>
<s>
In	O
addition	O
,	O
CCleaner	B-Application
can	O
automatically	O
update	O
computer	B-Application
software	I-Application
and	O
drivers	O
.	O
</s>
<s>
CCleaner	B-Application
has	O
its	O
own	O
web	B-Application
browser	I-Application
called	O
CCleaner	B-Protocol
Browser	I-Protocol
.	O
</s>
<s>
CCleaner	B-Protocol
Browser	I-Protocol
is	O
included	O
to	O
optionally	O
install	O
in	O
the	O
CCleaner	B-Application
installer	O
,	O
but	O
it	O
can	O
also	O
be	O
installed	O
from	O
its	O
.	O
</s>
<s>
CCleaner	B-Protocol
Browser	I-Protocol
blocks	O
online	O
advertisements	O
,	O
avoids	O
tracking	B-Application
,	O
has	O
built-in	O
security	O
against	O
malware	O
,	O
phishing	O
,	O
malicious	O
downloads	B-Application
,	O
and	O
also	O
avoids	O
potentially	O
unwanted	O
elements	O
like	O
pop-ups	O
or	O
excessive	O
browser	B-Application
cache	B-General_Concept
.	O
</s>
<s>
The	O
browser	B-Application
is	O
only	O
available	O
for	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
CCleaner	B-Application
also	O
develops	O
a	O
tool	O
called	O
Kamo	O
,	O
which	O
feeds	O
trackers	B-Application
fake	O
information	O
to	O
help	O
stop	O
a	O
'	O
digital	B-Protocol
fingerprint	I-Protocol
 '	O
(	O
a	O
unique	O
fingerprint	O
that	O
can	O
be	O
used	O
to	O
identify	O
and	O
track	O
people	O
)	O
from	O
being	O
created	O
.	O
</s>
