How to denote similar-to symbol in LaTeX?

A similar-to symbol is a logical-mathematical symbol denoted by ∼. Latex stores more than one command and package that represents a similar-to symbol.

\documentclass{article}
\begin{document}
 \[ a \sim b \]
 \[ p \sim q \]
\end{document}

Output :

The best practice is to use the direct \sim command without installing any packages.

Multiple logical symbols are used with the similar-to symbol. Such as equal, gatearthan, lessthen etc.

\documentclass{article}
\usepackage{amssymb,amsmath}
\begin{document}
 \[ \begin{matrix}
  \lesssim & \gtrsim & \succsim\\[6pt] 
  \backsim & \simeq & \backsimeq\\[6pt]
  \nsim & \lnsim & \gnsim
\end{matrix}\]
\end{document}

Output :

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