Can a procedure have different security settings from the person running it

I've seen on many occasions that people advocate updates to the database are performed through database procedures, and I'd like to do this. However, my understanding is that the procedure 'inherits' the security permissions of the user running it? If so, then how is it possible to 'expose' a procedure call to a user which allows them to perform inserts/updates/deletes etc, and yet at the same time, only allow the user to perform selects on the base table?
I simply want to ensure that the database is protected from changes that do not go through 'proper channels'...
Many thanks in advance.
Carl.

my understanding is that the procedure 'inherits' the security permissions of the user running it?This is not true, as it depends on the way the procedure has been defined. Which can be in two ways as Justin just explained.
It's true when the procedure has been defined with 'invoker rights'.
Default would however be that the procedure inherits the security permissions of the user that created the stored procedure (definer rights).

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