An apostrophe is a little mark. 
An apostrophe is a tiny mark. 
An apostrophe is a small punctuation mark. 
Second, it shows that something belongs to someone. This is called the possessive case. You might write "the cat's toy." If there are many cats, you write "the cats' toys." This helps readers know if one cat or many cats own the toys.
Sometimes, the mark is used for groups. We see this with the Oakland A's. The word comes from a Greek word. It means "turning away." This describes how letters are left out. People first used it in the 1400s. Later, it became common in English. It can even help with time. You can write "one hour's rest." This little mark keeps our writing clear and easy to read.
An apostrophe is a tiny punctuation mark that looks like a small comma. 
Learning how to use the apostrophe is like learning a secret code. To show one person owns something, you usually add an apostrophe and an "s." For example, you would write "the cat's whiskers." If you are talking about a group, the rules change slightly. If a group name already ends in "s," you just add the apostrophe at the end. This makes "the neighbors' garden" instead of "the neighbors's garden." This small mark helps us tell the difference between one thing and many things.
The history of this mark is quite long and interesting. The word "apostrophe" comes from a Greek word that means "turning away." 
There are many specific rules to follow when writing. For example, we use it for time, like writing "one hour's respite." We also use it for some groups, such as the Oakland A's. However, some words never need an apostrophe at all. Words like "his," "hers," "its," and "ours" are special pronouns. They show ownership without needing the little mark. It is also important to remember that "its" with no mark means something belongs to it. If you add a mark, it changes the meaning entirely.
You might see the apostrophe used in many different places in your daily life. Sometimes, people use it informally to stand in for other symbols. For instance, it can be used instead of a prime symbol for measurements. You might even see mistakes on signs in shops. 
The apostrophe is a versatile punctuation mark used in many writing systems. 
To use an apostrophe for elision, you place it where a letter or letters have been removed. This is common in contractions, such as turning "do not" into "don't." Historically, English writers used it to show when a vowel was no longer pronounced. This happened in words like "lov'd" instead of "loved." The mark can also be used for exceptional plurals. An example includes writing "p's and q's" or referring to the "Oakland A's." In informal writing, people sometimes substitute the apostrophe for a prime symbol. This is often done when measuring feet or minutes of arc.
The mechanics of the possessive apostrophe depend on the type of noun being used. For most singular nouns, you add an apostrophe followed by an "s," such as "the cat's whiskers." If a singular noun ends in an "s" sound, writers sometimes vary their style. For plural nouns that already end in "s," you simply add an apostrophe at the end. This results in "the neighbors' garden" rather than "the neighbors's garden." If the plural form does not end in "s," you must add an apostrophe and an "s." Examples include "children's hats" or "women's hairdresser."
Different rules apply to compound nouns and pronouns. For a compound noun like "father-in-law," you add the apostrophe to the end of the phrase. The singular possessive would be "her father-in-law's new wife." To make this plural and possessive, you add "s" to the main noun first. This creates "their fathers-in-law's new wives." When two people share something, you can mark only the last noun, like "Jack and Jill's children." If they own separate things, you mark both: "Jack's and Jill's children." However, personal pronouns like "his," "hers," "its," and "theirs" never take an apostrophe. 
The history of the apostrophe traces back to ancient linguistic roots. The word itself comes from the Greek term "hē apóstrophos," meaning "turning away" or "elision." This refers to the way sounds or letters are removed from speech. Pietro Bembo was the first to use the mark in his 1496 edition of "De Aetna." The practice was later introduced to English during the 16th century. This was done to imitate the writing styles used in France. In French, the mark was used to show where a vowel was omitted.
Standardization changed how the mark is used in modern English. By the 18th century, the "apostrophe + s" pattern became regular for singular possessives. This was not actually marking a missing letter. Instead, it represented the loss of an old Old English ending called "-es." This caused confusion with plural forms that also ended in "s." To solve this, writers began placing the apostrophe after the "s" for plural possessives. This specific rule for plurals did not become universally accepted until the mid-19th century.
Understanding the apostrophe helps clarify complex grammatical relationships. It allows writers to distinguish between singular and plural nouns clearly. For instance, "the glass's contents" refers to one glass, while "the glasses' contents" refers to many. The mark also helps in time and money expressions. You might write "one hour's respite" or "five pounds' worth." While it is a small symbol, it manages the flow of information. It prevents ambiguity in everything from legal documents to everyday signs.
🖼️ Images & Media (5)
More to explore
✨ What else?
Related topics you might enjoy
🪜 Step back
Simpler topics to build understanding
What is Nepedia?
A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.