Here are a few examples:
* As part of a list: "The meeting will be attended by the president, the vice president, or the secretary."
* As a clarifying phrase: "The CEO will be giving the presentation, or, if she's unavailable, the secretary will."
* As a question: "Is that the manager, or the secretary?"
In all these cases, the comma is used to separate the two options.
Important Note: If "or secretary" is part of a longer phrase or sentence, you'll need to consider the overall punctuation rules. For example:
* "Please contact the manager or secretary for assistance." (No comma needed)
Let me know if you have a specific sentence in mind, and I can help you with the punctuation!