Italics is used in a variety of cases.
MLA Style
Titles of books, reports, webpages, and other stand-alone works
- A Clash of Kings is my favorite book.
APA
First use of key terms or phrases, often accompanied by a definition
- Paraphrasing is defined as "a restatement of a text, passage, or work giving the meaning in another form" (Merriam-Webster, 2023).
Titles of books, reports, webpages, and other stand-alone works
- A Clash of Kings is my favorite book.
Titles of periodicals and periodical volume numbers (but not the comma between them)
- American Journal of Nursing, 119(9), 47–53.
English letters used as statistical symbols or algebraic variables
Anchors of a scale (but not the associated number)
- ranged from 1 (poor) to 5 (excellent)
First use of words, phrases, or abbreviations from another language when readers may not be familiar with them; however, if the term appears in a dictionary for the language in which you are writing, do not italicize it.
- Their new catchphrase was et tu?
