<s>
U1DB	B-Application
is	O
a	O
cross-platform	O
,	O
cross-device	O
,	O
syncable	O
database	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
.	O
</s>
<s>
It	O
allows	O
applications	O
to	O
store	O
JSON	B-General_Concept
documents	O
and	O
synchronize	O
them	O
between	O
machines	O
and	O
devices	O
.	O
</s>
<s>
U1DB	B-Application
is	O
a	O
schemaless	O
document-oriented	B-General_Concept
database	I-General_Concept
API	B-Application
that	O
does	O
not	O
need	O
to	O
contain	O
any	O
pre-defined	O
list	O
of	O
fields	O
.	O
</s>
<s>
U1DB	B-Application
was	O
created	O
when	O
Canonical	O
had	O
scaling	O
issues	O
with	O
CouchDB	B-Application
previously	O
used	O
in	O
their	O
Ubuntu	B-Language
One	I-Language
service	O
.	O
</s>
<s>
Defining	O
an	O
interface	O
(	O
API	B-Application
)	O
allowed	O
them	O
to	O
implement	O
their	O
data	O
synchronization	O
service	O
using	O
different	O
languages	O
and	O
data	O
stores	O
on	O
each	O
platform	O
.	O
</s>
