Histogram

\usepackage{pgfplots}
\pgfplotsset{compat=1.17}

\begin{tikzpicture}
  \begin{axis}[
    ybar,
    ymin=0,
    xlabel={Bin},
    ylabel={Count},
    symbolic x coords={A, B, C, D, E}
  ]
    \addplot coordinates {(A,5) (B,8) (C,3) (D,12) (E,6)};
  \end{axis}
\end{tikzpicture}