After the parenthesis.
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Use a period inside of the closing parenthesis to indicate that the sentence within the parentheses is ending. Use a period outside of the closing parenthesis to indicate that the sentence in which the parenthetical occurs is ending. Example: This was published in 1968 (Mary Jenkins looked it up.). or This was published in 1968. (Mary Jenkins looked it up.)
To explain something within the sentence without finishing the sentence before explaining.
yes
If a comma is needed, it normally comes after parenthesis.
before, (like this).