Unix: Why is double bracket used to 'ensure' some commands, since it is not a logical check for "...

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Why is double bracket used to 'ensure' some commands, since it is not a logical check for "does it exist or not' (false/true)?
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(unix.stackexchange.com/users/578381/andreyan-enchev-boyadzhiev)Andreyan Enchev Boyadzhiev
(unix.stackexchange.com/users/86440/stephen-kitt)Stephen Kitt
(unix.stackexchange.com/users/9178/symcbean)symcbean
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