Periods go at the end of declarative (statements) and imperative (commands) sentences, after initials and abbreviations (like U.S. or Dr.), and inside quotation marks if they belong to the quoted sentence, otherwise outside if they end the whole sentence; remember a single space after the period before the next sentence begins.
The period is used to end all sentences except those that are direct questions or exclamations. Periods are also used in abbreviations.
End of Sentence
A period is used to signal the end of a complete sentence. Correct: This is the best paper I've ever written. A period is also used at the end of an indirect question.
Neither Chicago nor AP nor any other style that we know of—including APA, as of the seventh edition of its style manual, published in late 2019—recommends more than one space after a period.
As a rule, you should: Place periods inside brackets when an entire sentence is parenthetical.
The final period or comma goes inside the quotation marks, even if it is not a part of the quoted material, unless the quotation is followed by a citation.
Please see CMOS 6.118: “An apostrophe should not be confused with a single closing quotation mark; when a word ends in an apostrophe, no period or comma should intervene between the word and the apostrophe.”
From around 1950, single sentence spacing became standard in books, magazines, and newspapers, and the majority of style guides that use a Latin-derived alphabet as a language base now prescribe or recommend the use of a single space after the concluding punctuation of a sentence.
The need for two spaces after a period is leftover from the days of typewriters and monospaced fonts. Typewriters used fonts where each character took up the same amount of horizontal space, regardless of its width. This made two spaces after a period necessary to create a visual break between sentences.
A space is required in between each word in a phrase. Here, we are talking about the words; there are, of course, examples of punctuation that need no space preceding and/or following a word. The weather doesn't look inviting.
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Punctuation serves as the compass that guides readers through the landscape of our thoughts. emphasizing key points. Their correct usage reflects a writer's diligence and attention to detail, qualities that are indispensable in both academic and professional settings.
The full stop (Commonwealth English), period (North American English), or full point (.), is a punctuation mark used for several purposes, most often to mark the end of a declarative sentence (as distinguished from a question or exclamation).
Even so, it's perfectly acceptable to add a comma, semicolon, or colon after a period, as long as the period is used for an abbreviation.
Punctuation in brief
Use a comma to create a pause, to separate ideas in that sentence. Use a full stop to create the end of that sentence.
By convention, if an abbreviated word (such as "etc.") ends a sentence, let a single period signal the sentence's end—two periods in a row would be incorrect. In acronyms commonly understood or commonly used in your field (ASTM, EPA, US, GIS), do not use periods after the capital letters.
Some firms, judges, and courts have stuck to double-spacing after a sentence, so it's important to consult whatever set of style guidelines you're working under when deciding how to space a document. However, both the Chicago Manual of Style and the American Bar Association suggest a single space after a period.
If you learned to type on a typewriter before word processors became the norm, two spaces after a period was required and taught as correct. The extra space was needed to delineate the beginning of a new sentence because the spacing between words was uneven on a typewriter.
Well it turns out that's an actual linguistic phenomenon called the punctuation cushion and it serves an important role softening the tone of a message. That's because in the same way that it feels more intense to end the text of the period it's also more intense when the punctuation comes directly after the text.
It's a holdover from the days of mechanical typewriters using a monospaced typeface. It was standard practice at that time to leave two spaces after a period so the spacing between sentences was more distinct, making the typing easier to read.
According to every major style guide in both academic and business writing, one space is recommended after a period or other punctuation mark at the end of a sentence.
A double space after a sentence helped things look more uniform. As others in this thread have said, because of changes in typesetting the double space isn't necessary anymore. There's a good reason not to do it beyond this though; extra spaces can create what they call " rivers " on a page.
A period (also sometimes called a “full stop”) is used to tell the reader when the sentence ends. The subject is a noun; it is what the sentence is about. The verb is an action word. A sentence can be short or long and still be grammatically correct.
It's Lopez's for singular possession (e.g., Lopez's car) and Lopezes' for plural possession (e.g., the Lopezes' house), but you can also use just an apostrophe for singular names ending in 's' or 'z' (e.g., Lopez' car) or rephrase to avoid the issue entirely by saying the Lopez family.
For decades, use '70s (with an apostrophe before the number for the missing "19") for contractions like "the '70s," and use 1970s (no apostrophe) for the full form or as an adjective (e.g., "1970s music"), while 70s (no apostrophe) is a common plural, but avoid 70's as it incorrectly suggests possession or pluralizes the number itself, not the decade.