Simple Definition:

Sic is a word used in writing to show that a mistake or an unusual word or phrase was written that way intentionally. It is used mostly in quotations or citations to indicate that the original text contained the mistake or unusual wording. Sic is normally used inside sqaure brackets.

For example:

• The book said, “He is a grate [sic] actor.”
• The sign read, “Please do not park hear [sic].”

Very Simple Definition:

Sic is a word that means “I wrote it like this on purpose.” It is used to show that a mistake or strange word was written that way intentionally.

For example:

• The book said, “He is a grate [sic] actor.” (this shows that the person writing this wrote it incorrectly intentionally, because that’s how it was originally written)
• The sign read, “Please do not park hear [sic].”