Answers for "how to add a url link to overleaf"

url in latex

\usepackage{hyperref}
%Use \href{URL}{DESCRIPTION} to add a link with description.
%Use \url{URL} to add a link without a description.

include link in latex

\documentclass{article} % or any other documentclass

%...

\usepackage{hyperref}

%...

\begin{document}

%...

\end{document}