In LaTeX the default font typeface is the Computer Modern family. You can change this font typeface for another that better suits your style.

Introduction

To change the fond typeface of the entire document, a simple line must be added to the preamble:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{tgbonum}

\begin{document}
This document is a sample document to test font 
families and font typefaces.

This text uses a different font typeface
\end{document}

The line \usepackage{tgbonum} establishes the font family TeX Gyre Bonum, whose font package name is tgbonum, as the default font for this document.

  Open an example in Overleaf

Changing default font typeface

The font can also be changed for a specific element in the document.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{geometry}
\geometry{textwidth=7cm}

\usepackage{tgbonum}

\begin{document}
This document is a sample document to 
test font families and font typefaces.

{\fontfamily{qcr}\selectfont
This text uses a different font typeface
}
\end{document}

The command \fontfamily{qcr}\selectfont will set the TeX gyre cursor font typeface, whose fontcode is qcr, for the text inside the braces. A lot more LaTeX font typefaces are available, see the reference guide.

The popular LaTeX font typefaces are originated from four families:

• Computer Modern (default in standard LaTeX classes): CM Roman, CM Sans Serif, CM Typewriter
• Latin Modern: LM Roman, LM Sans Serif, LM Typewriter, LM Dunhill
• Post Script Fonts: Times, Utopia/Fourier, Palatino, Bookman, Helvetica, Courier
• TeX Gyre

  Open an example in Overleaf

Reference guide

Roman, Sans Serif and Typewriter typefaces

Font	"fontpackagename"	"fontcode"	Example
Computer Modern Roman		cmr
Latin Modern Roman	lmodern	lmr
Latin Modern Dunhill	lmodern	lmdh
TeX Gyre Termes	tgtermes	qtm
TeX Gyre Pagella	tgpagella	qpl
TeX Gyre Bonum	tgbonum	qbk
TeX Gyre Schola	tgschola	qcs
Times	mathptmx	ptm
Utopia / Fourier	utopia / fourier	put
Palatino	palatino	ppl
Bookman	bookman	pbk
Charter	charter	bch
Computer Modern Sans Serif		cmss
Latin Modern Sans Serif	lmodern	lmss
TeX Gyre Adventor	tgadventor	qag
TeX Gyre Heros	tgheros	qhv
Helvetica	helvet	phv
Computer Modern Typewriter		cmtt
Latin Modern Sans Typewriter	lmodern	lmtt
TeX Gyre Cursor	tgcursor	qcr
Courier	courier	pcr

See also The LaTeX Font Catalogue, though not that not all fonts listed in the catalogue is distributed with a license that allows it to be distributed as part of TeX Live, and therefore not all those fonts are available on Overleaf.

  Open an example in Overleaf

Further reading

For more information see:

• The LaTeX Font Catalogue.
• Bold, italics and underlining
• Font sizes, families, and styles
• Supporting modern fonts with XeLaTeX
• Paragraph formatting
• Line breaks and blank spaces
• Multiple columns
• Single sided and double sided documents
• Management in a large project
• Multi-file LaTeX projects