Why are there uppercase and lowercase letters?


Lowercase letter definition: Lowercase letters are all other letters not in uppercase.

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Uppercase letter definition: Uppercase letters are letters that represent the beginning of a sentence or a proper noun.

What are Lowercase Letters?

In writing, most letters are lowercase. Lowercase letters are all letters that vì chưng not begin a sentence or refer to a proper noun.

English alphabet lowercase letters: a b c d e f g h i j k l m n o p. Q r s t u v w x y z.

Examples of Lowercase Letters:

wordThe word above uses only lowercase letters.The sentence above has lowercase letters after the first letter of the sentence.This sentence and the one directly above have all lowercase letters except for the “T.”

What are Uppercase Letters?

Uppercase letters are also known as capital letters. Uppercase letters signal to lớn the reader that something is important or significant.

English alphabet uppercase letters: A B C D E F G H I J K L M N O p. Q R S T U V W X Y Z.

Examples of Uppercase Letters:

JonesThis is a proper name, so the first letter of the title và the last name are capitalizedMain StreetThis is a proper noun so the first letter of each word is capitalized

When to Use Uppercase Letters

In English, the first letter of every sentence is capitalized. The uppercase letter signals lớn the reader that a new sentence is beginning.

Other uses of uppercase letters are detailed below.


All titles are considered proper nouns & require capitalization.

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Miss MabryIncorrect: miss mabryMathersIncorrect: mr. MathersMadam LockfieldIncorrect: madam lockfieldLady GraceIncorrect: lady graceJanksIncorect: mrs. Janks


Acronyms are a type of abbreviation. Acronyms are words formed from other letters lớn make a new word. However, they require capital letters lớn signal lớn the reader that those letters stand for something & are not a word alone.


NATONorth Atlantic Treaty OrganizationUNICEFUnited Nations International Children’s Emergency FundSCUBASelf-contained underwater breathing apparatus

All Proper Nouns

All proper nouns need lớn be capitalized.


We visited the Bowers Museum on Saturday.Incorrect: We visited the bowers museum on Saturday.I would like to tour the Eiffel Tower.Incorrect: I would lượt thích to tour the eiffel tower.Their names are Jake and Suzy.Incorrect: Their names are jake and suzy.

When khổng lồ Use Lowercase Letters

Use lowercase letters for all letters other than the first in a sentence, provided that there is no required use for uppercase letters in the sentence.


Every word in this sentence other than the first word is written in lowercase.The only words in this sentence that require uppercase letters are the proper nouns, London and Paris.

All nouns that are not proper nouns are called common nouns. All common nouns use lowercase letters (unless a common noun begins a sentence).




Define lowercase letters: lowercase letters are those letters used for common nouns và internal words.

Define uppercase letters: uppercase letters (also called capital letters) are those letters that signify the beginning of a sentence or a proper noun.

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In summary,

Uppercase và lowercase letters refer khổng lồ all letters used to compose the English language.Uppercase letters are used khổng lồ begin sentences và are also used for proper nouns.Lowercase letters are all letters that vì not begin sentences.