<s>
Nix	B-Application
is	O
a	O
cross-platform	B-Operating_System
package	B-Application
manager	I-Application
that	O
utilizes	O
a	O
purely	O
functional	B-Language
deployment	O
model	O
where	O
software	O
is	O
installed	O
into	O
unique	O
directories	O
generated	O
through	O
cryptographic	B-Algorithm
hashes	I-Algorithm
.	O
</s>
<s>
A	O
package	O
's	O
hash	B-Algorithm
takes	O
into	O
account	O
the	O
dependencies	O
,	O
which	O
is	O
claimed	O
to	O
eliminate	O
dependency	B-Protocol
hell	I-Protocol
,	O
as	O
an	O
alternative	O
to	O
the	O
typical	O
solution	O
of	O
installing	O
multiple	O
versions	O
of	O
dependencies	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
This	O
package	B-Application
management	I-Application
model	O
advertises	O
more	O
reliable	O
,	O
reproducible	B-Application
,	O
and	O
portable	O
packages	O
.	O
</s>
<s>
Nix	B-Application
packages	O
are	O
defined	O
through	O
a	O
lazy	O
functional	B-Language
programming	I-Language
language	I-Language
specifically	O
designed	O
for	O
package	B-Application
management	I-Application
.	O
</s>
<s>
A	O
Nix	B-Application
environment	O
keeps	O
track	O
of	O
references	O
automatically	O
,	O
which	O
allows	O
unused	O
packages	O
to	O
be	O
garbage	B-General_Concept
collected	I-General_Concept
when	O
no	O
other	O
package	O
depends	O
on	O
them	O
.	O
</s>
<s>
At	O
the	O
cost	O
of	O
greater	O
storage	O
requirements	O
,	O
all	O
upgrades	O
in	O
Nix	B-Application
are	O
guaranteed	O
to	O
be	O
both	O
atomic	B-General_Concept
and	O
capable	O
of	O
efficient	O
roll-back	O
.	O
</s>
<s>
This	O
also	O
enables	O
multiple	O
users	O
to	O
safely	O
install	O
software	O
on	O
the	O
same	O
system	O
without	O
administrator	B-Application
privileges	I-Application
.	O
</s>
<s>
Nix	B-Application
has	O
full	O
support	O
for	O
Linux	B-Application
and	O
macOS	B-Application
and	O
can	O
safely	O
be	O
installed	O
side	O
by	O
side	O
with	O
an	O
existing	O
package	B-Application
manager	I-Application
.	O
</s>
<s>
NixOS	O
is	O
a	O
Linux	B-Application
distribution	I-Application
using	O
Nix	B-Application
for	O
managing	O
software	O
in	O
the	O
system	O
,	O
including	O
the	O
Linux	B-Application
kernel	O
.	O
</s>
<s>
Nixpkgs	O
is	O
the	O
package	O
repository	O
built	O
upon	O
the	O
Nix	B-Application
package	I-Application
manager	I-Application
.	O
</s>
