What is a settings group actually for?

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say i have an option 

update_option('pp_options', $options);

when i want to create a form for that, i learnt that i have to create a settings group

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register_setting('pp_options_group', 'pp_options');

then in the form do 

settings_fields('pp_options_group')

but i dont really what is the settings group actually for? i know its to do with sanitization but why the need to create a group for sanitization?

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  1. Sanitization is secondary function. Main is:

    The register_setting and unregister_setting functions add and remove options from a whitelist of allowed options that the form is able to save. They can also name a sanitize callback function as a security measure to check each option’s value. ( Register settings )

    Technically $option_group argument is used for:

    • array key in global array of whitelisted options
    • part of filter name to run sanitization callback