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What is a trap and trapdoor?

Answer Posted / miss. clever

a trap is a type of synchronous interrupt typically caused
by an exceptional condition (e.g., breakpoint, division by
zero, invalid memory access). A trap usually results in a
switch to kernel mode, wherein the operating system performs
some action before returning control to the originating
process.

Trapdoor is a secret undocumented entry point into a
program used to grant access without normal methods of
access authentication.

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