Keyword Analysis & Research: using namespace std what does it mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
using namespace std what does it mean	0.51	0.6	5736	54	37
using	0.33	0.4	1098	88	5
namespace	1.26	0.4	5237	49	9
std	0.29	1	400	40	3
what	1.2	0.9	2157	16	4
does	0.82	0.1	8844	100	4
it	1.6	0.6	2357	31	2
mean	0.95	0.7	5327	3	4

Keyword	CPC	PCC	Volume	Score
using namespace std what does it mean	1.25	0.2	2481	54