Interjections do not adhere to standard English punctuation rules. Since they have no connection with the rest of the sentence, they are typically written independently and punctuated with a period or an exclamation mark.
Consider the sentence, “Oops! I am so sorry.” In this, the word “oops” can be used as a standalone word without the entire sentence and still make sense. Commas can also be used as punctuation after interjections.
Consider the sentence, “Oops, I dropped the vase.” Here, the interjection “oops” is separated using a comma. In some cases, punctuation is decided by the emotion or message expressed by the speaker. Typically, exclamation points are used to show strong emotions like excitement, sorrow, or surprise.