<s>
Phoenix	B-Application
is	O
a	O
web	B-Application
development	I-Application
framework	I-Application
written	O
in	O
the	O
functional	B-Language
programming	I-Language
language	I-Language
Elixir	B-Language
.	O
</s>
<s>
Phoenix	B-Application
uses	O
a	O
server-side	B-Application
model	O
–	O
view	O
–	O
controller	O
(	O
MVC	O
)	O
pattern	O
.	O
</s>
<s>
Based	O
on	O
the	O
library	O
,	O
and	O
ultimately	O
the	O
Erlang	B-Operating_System
framework	O
,	O
it	O
was	O
developed	O
to	O
provide	O
highly	O
performant	O
and	O
scalable	O
web	O
applications	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
request/response	O
functionality	O
provided	O
by	O
the	O
underlying	O
Cowboy	O
server	O
,	O
Phoenix	B-Application
provides	O
soft	O
realtime	O
communication	O
to	O
external	O
clients	O
through	O
WebSockets	B-Protocol
or	O
long	O
polling	O
using	O
its	O
language	O
agnostic	O
.	O
</s>
<s>
Two	O
notable	O
features	O
of	O
Phoenix	B-Application
are	O
LiveView	O
and	O
HEEx	O
.	O
</s>
<s>
HEEx	O
is	O
Phoenix	B-Application
's	O
templating	O
language	O
.	O
</s>
