<s>
A	O
JavaScript	B-Language
library	I-Language
is	O
a	O
library	B-Library
of	O
pre-written	O
JavaScript	B-Language
code	O
that	O
allows	O
for	O
easier	O
development	O
of	O
JavaScript-based	O
applications	O
,	O
especially	O
for	O
AJAX	B-General_Concept
and	O
other	O
web-centric	O
technologies	O
.	O
</s>
<s>
With	O
the	O
expanded	O
demands	O
for	O
JavaScript	B-Language
,	O
an	O
easier	O
means	O
for	O
programmers	O
to	O
develop	O
such	O
dynamic	O
interfaces	O
was	O
needed	O
.	O
</s>
<s>
Thus	O
,	O
JavaScript	B-Language
libraries	I-Language
and	O
JavaScript	B-Language
widget	B-Library
libraries	I-Library
were	O
developed	O
,	O
allowing	O
for	O
developers	O
to	O
concentrate	O
more	O
upon	O
more	O
distinctive	O
applications	O
of	O
Ajax	B-General_Concept
.	O
</s>
<s>
This	O
has	O
led	O
to	O
other	O
companies	O
and	O
groups	O
,	O
such	O
as	O
Microsoft	O
and	O
Yahoo	B-Application
!	I-Application
</s>
<s>
developing	O
their	O
own	O
JavaScript-based	O
user	O
interface	O
libraries	O
,	O
which	O
find	O
their	O
way	O
into	O
the	O
web	O
applications	O
developed	O
by	O
these	O
companies	O
.	O
</s>
<s>
Some	O
JavaScript	B-Language
libraries	I-Language
allow	O
for	O
easier	O
integration	O
of	O
JavaScript	B-Language
with	O
other	O
web	O
development	O
technologies	O
,	O
such	O
as	O
CSS	B-Language
,	O
PHP	B-Application
,	O
Ruby	B-Language
,	O
and	O
Java	B-Language
.	O
</s>
<s>
While	O
others	O
provide	O
utilities	O
,	O
often	O
in	O
the	O
form	O
of	O
JavaScript	B-Language
functions	O
,	O
to	O
make	O
repetitive	O
and	O
complex	O
tasks	O
less	O
taxing	O
.	O
</s>
<s>
Almost	O
all	O
JavaScript	B-Language
libraries	I-Language
are	O
released	O
under	O
either	O
a	O
permissive	O
or	O
copyleft	B-License
license	I-License
to	O
ensure	O
license-free	O
distribution	O
,	O
usage	O
,	O
and	O
modification	O
.	O
</s>
<s>
Some	O
JavaScript	B-Language
libraries	I-Language
,	O
such	O
as	O
Angular	B-Language
,	O
are	O
classified	O
as	O
frameworks	B-Architecture
since	O
they	O
exhibit	O
full-stack	O
capabilities	O
and	O
properties	O
not	O
found	O
in	O
general	O
JavaScript	B-Language
libraries	I-Language
.	O
</s>
<s>
All	O
npm	O
packages	O
are	O
JavaScript	B-Language
libraries	I-Language
,	O
but	O
not	O
all	O
libraries	O
are	O
packages	O
.	O
</s>
<s>
Npm	O
originally	O
stood	O
for	O
"	O
Node	O
Package	O
Manager	O
"	O
,	O
as	O
the	O
name	O
implies	O
,	O
npm	O
serves	O
as	O
a	O
package	O
manager	O
for	O
packages	O
used	O
in	O
Node.js	B-Language
runtimes	O
.	O
</s>
<s>
However	O
,	O
some	O
npm	O
packages	O
offer	O
CDN	B-Operating_System
support	O
for	O
use	O
of	O
the	O
library	B-Library
in	O
both	O
Node.js	B-Language
runtimes	O
as	O
well	O
as	O
the	O
browser	O
.	O
</s>
