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Simple text formatting helps to highlight important concepts within a document and make it more readable. Using italics, bold or underlined words can change the perception of the reader. Contents 1 Introduction 2 Italicized text 3 Bold text 4 Underlined text 5 Emphasising text 6 Further reading  Introduction In this article three basic text formatting tools will be explained: italics, bold and underline. Let's begin with an example: Some of the \textbf{greatest} discoveries in \underline{science} were made by \textbf{\textit{accident}}. As you can see, there are three basic commands and they can be nested to get combined effects. Note: The commands \it and \bf also work to italicize and boldface text, but it's not recommended to use them since they don't preserve previous styles. With these you can't, for instance, italicize and make a text bold at the same time.   Open an example in Overleaf  Italicized text To make a text italic is straightforward, use the \emph or \textit command: Some of the greatest discoveries in science were made by \emph{accident}.   Open an example in Overleaf  Bold text To make a text bold use \textbf command: Some of the \textbf{greatest} discoveries in science were made by accident.   Open an example in Overleaf  Underlined text Underlining text is very simple too, use the \underline command: Some of the greatest discoveries in \underline{science} were made by accident.   Open an example in Overleaf  Emphasising text Text can be emphasized by using \emph command. Sometimes the \emph command behaves just as \textit, but is not exactly the same: Some of the greatest \emph{discoveries} in science were made by accident.   \textit{Some of the greatest \emph{discoveries} in science were made by accident.}   \textbf{Some of the greatest \emph{discoveries} in science were made by accident.} What the \emph command actually does with its argument depends on the context - inside normal text the emphasized text is italicized, but this behaviour is reversed if used inside an italicized text- see example above: Moreover, some packages, e.g. Beamer, change the behaviour of \emph command.   Open an example in Overleaf  Further reading For more information see Paragraphs and new lines Lists Paragraph formatting Line breaks and blank spaces The not so short introduction to LaTeX2ε