what is uppercase letters

Uppercase letters, also known as capital letters, are one of the two forms that the 26 letters in the English alphabet can take. They are used for the beginning of sentences, proper nouns, and abbreviations. Uppercase letters are larger than their lowercase counterparts, and most of them look similar to their lowercase partners, although some take slightly different forms. Lowercase letters are used for all the remaining letters in sentences and following the first letter of proper nouns. In English, the first letter of every sentence is capitalized, and all titles are considered proper nouns and require capitalization. Lowercase letters are all other letters not in uppercase.