<s>
gVisor	B-Application
is	O
a	O
container	O
sandbox	O
developed	O
by	O
Google	B-Application
that	O
focuses	O
on	O
security	O
,	O
efficiency	O
and	O
ease	O
of	O
use	O
.	O
</s>
<s>
gVisor	B-Application
implements	O
around	O
200	O
of	O
the	O
Linux	B-Application
system	I-Application
calls	I-Application
in	O
userspace	B-Operating_System
,	O
for	O
additional	O
security	O
compared	O
to	O
Docker	B-Language
containers	O
that	O
run	O
directly	O
on	O
top	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
and	O
are	O
isolated	O
with	O
namespaces	B-Architecture
.	O
</s>
<s>
Contrary	O
to	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
the	O
project	O
is	O
written	O
in	O
the	O
memory-safe	B-Application
programming	O
language	O
Go	B-Application
to	O
prevent	O
common	O
pitfalls	O
which	O
frequently	O
occur	O
with	O
software	O
written	O
in	O
C	B-Language
.	O
</s>
<s>
gVisor	B-Application
is	O
being	O
used	O
in	O
Google	B-Application
's	I-Application
production	O
environment	O
like	O
App	B-Application
Engine	I-Application
standard	O
environment	O
,	O
Cloud	O
Functions	O
,	O
Cloud	O
ML	O
Engine	O
and	O
Google	B-General_Concept
Cloud	I-General_Concept
Run	I-General_Concept
according	O
to	O
Google	B-Application
and	O
Brad	O
Fitzpatrick	O
.	O
</s>
<s>
Most	O
recently	O
gVisor	B-Application
has	O
been	O
integrated	O
with	O
Google	B-Application
Kubernetes	B-General_Concept
Engine	O
and	O
it	O
allows	O
users	O
to	O
sandbox	O
their	O
Kubernetes	B-General_Concept
pods	O
for	O
use	O
cases	O
like	O
SaaS	B-Architecture
and	O
multitenancy	B-Architecture
.	O
</s>
