Final answer:
Ellipses indicate omitted words in a quotation for brevity or clarity, while brackets are used within quotations to clarify or to make necessary changes in the context of writing.
Step-by-step explanation:
The function of ellipses in writing is to indicate that words have been omitted from a direct quotation. This can be done for brevity or to remove irrelevant information without altering the meaning of the quote. Ellipses, therefore, should be used carefully to ensure that the essence of the quoted material is preserved. It's also important to use brackets to add clarification or to make slight changes within a quotation that are essential for the quote to make sense within the context of your writing. For example, a writer might alter the original quotation from "Cybersecurity is an important issue for businesses of all sizes. Every business from Fortune 500 companies to mom-and-pop stores has an obligation to protect customers' sensitive data. Data breaches, such as the Target breach in 2014, have been known to erode trust." to "Cybersecurity is an important issue for businesses… Data breaches, such as the Target breach in 2014, have been known to erode [consumers'] trust [in the company]." where the ellipses indicate omitted words and brackets show added information for clarity.