The settings you choose for hyphenation and justification affect the horizontal spacing of lines and the aesthetic appeal of type on your pages. Hyphenation options determine whether words can be hyphenated and, if they can, which breaks are allowable.
Justification is controlled by the alignment option you choose, the word spacing and letterspacing you specify, and whether or not you have used glyph scaling. You can also justifying single words in narrow columns of fully justified text.
You can hyphenate words manually or automatically, or you can use a combination of the two methods. The safest way to hyphenate manually is to insert a discretionary hyphen, which is not visible unless the word needs to be broken at the end of a line. Placing a discretionary hyphen at the beginning of a word prevents it from being broken.
Choose Type > Insert Special Character > Hyphens and Dashes > Discretionary Hyphen.
Press Ctrl+Shift+- (Windows) or Command+Shift+- (Mac OS) to insert a discretionary hyphen.
Hyphenation is based on word lists that can be stored either in a separate user dictionary file on your computer, or in the document itself. To ensure consistent hyphenation, you may want to specify which word list to refer to, especially if you will be taking your document to a service provider or if you work in a workgroup.
When you set automatic hyphenation options, you can determine the relationship between better spacing and fewer hyphens. You can also prevent capitalized words and the last word in a paragraph from being hyphenated.