The periods and punctuation

- The period is a full stop, signaling the end of a sentence. This is the most common way to end a sentence (There also exists the exclamation mark (!), and the question mark (?).) While there is some disagreement over how many spaces should go after a period, one space is standard (and two is also acceptable).

- When the sentence ends with quotation marks, the period is placed within the quotation. This is required whether-or-not the quotation includes a period. If either an exclamation point or question mark is used, omit the period completely.