Specify Typeface as Arial for the Whole Document in LaTeX

YouTube video¹ provides a way to globally specify typeface as Arial in a LaTeX document, that is using \setmainfont commands provided by fontspec package²:

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\usepackage{fontspec}
\setmainfont{Arial}

A complete example is like:

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\documentclass[a4paper]{article}
\usepackage[margin=1in]{geometry}

\usepackage{lipsum}

\usepackage[x11names]{xcolor}
\pagecolor{AntiqueWhite1}

\usepackage{fontspec}
\setmainfont{Arial}

\begin{document}
	\lipsum[1-8]
\end{document}

But, it should be noted that fontspec package is for compilers XeLaTeX and LuaLaTeX². For example, the following error occurred when I made the first compilation:

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Fatal Package fontspec Error: The fontspec package requires either XeTeX or(fontspec) LuaTeX. \msg_fatal:nn {fontspec} {cannot-use-pdftex}
Emergency stop. \msg_fatal:nn {fontspec} {cannot-use-pdftex}

because I used pdfLaTeX. It works after I changing the compiler³: in Options > Configure TeXstudio > Build > Default Compiler from my previous setting txs:///pdflatex to txs:///xelatex.

References