how does captcha verification work

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how does captcha verification work	0.76	0.6	7887	74	34
how	1.59	0.4	774	61	3
does	1.79	0.3	7104	80	4
captcha	1.18	1	9473	79	7
verification	0.13	0.1	3642	36	12
work	1.39	0.6	1505	82	4

Keyword	CPC	PCC	Volume	Score
how does captcha verification work	0.09	0.3	4692	10
linkedin verification captcha not working	1.84	0.4	8193	66
captcha verification failed	0.49	0.4	7018	93
captcha verification not working	1.84	0.5	1486	46
captcha verification error	0.95	0.6	6982	81
captcha verification code	1.38	0.8	1883	2
captcha verification was not successful	1.17	0.2	1811	9
captcha verification required	1.17	0.4	512	21
captcha verification website	0.57	0.5	6100	63
linkedin captcha not working	1.7	0.6	3831	77
linkedin no captcha error	1.81	0.7	4878	81
verify captcha not working	1.06	1	4249	20
captcha verification not showing	0.38	1	4165	84
captcha is not verified	1.55	0.7	6772	18
captcha verification has failed	0.21	0.2	3381	14
error: captcha not verified	1.11	0.4	7595	3
linkedin sign up no captcha	0.37	0.2	9033	57
could not verify captcha	1.31	0.4	2088	40
captcha verification process failed	1.72	0.6	6751	26
how to stop captcha verification	1.72	0.4	274	2
captcha code failed verification	0.43	0.6	5970	23
we are unable to verify your captcha	1.28	0.8	7921	60
failed to verify captcha	1.66	0.1	935	38
unable to verify your captcha answer	0.12	1	4876	49
linkedin your nocaptcha is missing or invalid	1.01	0.7	3896	85
problem verifying the captcha	0.49	0.5	904	87