How to get rid of navigation bars in beamer

Question

How to remove the navigation bar of sections and subsections on the top of each slide generated from a beamer latex file?

By the way, in my preamble, I wrote:

Answer 1

The section navigation at the top of the frame is part of the headline. The easiest way to remove it is to change the headline template.

The line \setbeamertemplate{navigation symbols}{} is unrelated to the sections in the headline, this will remove the little symbols at the bottom right if the frame.

\documentclass{beamer}

\setbeamertemplate{navigation symbols}{}
\useoutertheme{shadow}

\setbeamertemplate{headline}{}

\begin{document}

\section{title}
\begin{frame}
\end{frame}

\end{document}