i am really confused in anonymous and non-anonymous surveys!!

i read the manual, LS has
anonymous VS non-anonymous surveys
open mode VS close mode survey.
Token VS non-token survey.
i really confused when i understand them. anybody can use one sentence to let me know the difference between them.

what's the usage if we set to non-anonymous survey and don't use token?

Non-anonymous only applies when tokens are used.

Token VS non-token:
Only respondents with a token can participate.
manual.limesurvey.org/Tokens#Introduction

Anonymous VS non-anonymous:
When tokens are used, if set to "anonymous", there is no connection between the token table and the data. No token information can be exported with the data
manual.limesurvey.org/Tokens#Can_a_surve...onymous_responses.3F

Open mode VS close mode survey
This typically refers to whether tokens are used or not.
Another possible reference may be to when tokens are used, whether public registration is allowed.
manual.limesurvey.org/Tokens#Public_registration

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