When should the symbol for 'and' be used and not?

The symbol for 'and' (&) is typically used in informal contexts, such as in branding, marketing, or casual writing, where brevity is preferred. It is also common in titles, headings, or company names. However, in formal writing, academic papers, or professional documents, it is best to use the Word 'and' to maintain a more polished and traditional tone. Always consider the audience and context when deciding which to use.