Are the letters a and b capitalized or lowercase in English?

Case letters of A B C D in English:

1. Uppercase: a b c d

2. Lowercase: a b c d?

Uppercase letters, or capital letters, are one of the written forms of many phonetic alphabets, e.g., A, B, C, and so on.

General uses of capital letters:

1. Used at the beginning of a sentence.

2. Abbreviations.

3. To increase legibility. Examples include signs and labels.

4, In some languages, it has an emphasizing effect.

5. Proper names such as names of people and places.

Lowercase letters, also known as lowercase, are one of the two letter forms that exist in the Roman, Greek, and Cyrillic alphabets; for example, there are two forms of the first letter of the Roman alphabet, with A in upper case and a in lower case.

Expanded Information:

Capitalization is sometimes called Uppercase because in the West, in the old days of movable type printing, all capitalized type was placed on the top shelf of the checker drawer, hence the nickname.

The height and width of uppercase and lowercase fonts are generally distinct, but in some languages there is no distinction between upper and lower case, and in the early days of the invention of the Latin alphabet, there was only one type of font, i.e., uppercase.

The use of upper and lower case, from the beginning of the word, the first letter of the sentence to write a larger habit, and later these larger letters will be unified into the ancient Greek and Roman period of the use of the font, that is, we are now cognizant of the uppercase letters, the use of upper and lower case letters of the rules of the last three hundred years to gradually unified, and therefore also caused by the language of the rules of the upper and lower case are not the same.

Baidu Encyclopedia - Uppercase Letters

Baidu Encyclopedia - Lowercase Letters