Abbreviation may refer to any of the following:
1. An abbreviation is a shortened version of a word that is pronounced as individual letters. For example, "HTML" is an abbreviation for "Hypertext Markup Language" and is pronounced H-T-M-L.
Abbreviation vs. an acronym
Both acronyms and abbreviations are shortened forms of another word, which makes it confusing when trying to make a distinction between the two. For example, "Dr." is an abbreviation of "Doctor" and both forms are pronounced the same way. An acronym is a shortened word created from the letters contained in multiple words or a phrase. For example, "RAM" is an acronym for "random access memory."
The biggest distinctions between an acronym and an abbreviation is that an acronym simplifies a long name or term and forms a new word that can be pronounced. An abbreviation is not pronounced as a word.