\documentclass{article}

\usepackage{graphicx} %Loads a graphics package.

\begin{document}

You can typeset images with the file extension .gif, .jpg, .png, or .pdf.

\begin{center}
\includegraphics[width=3in]{mathglasses.jpg}
%You must save the image file in the same location as the .tex file.
\end{center}

\end{document}