Bar Chart

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

\begin{tikzpicture}
  \begin{axis}[
    ybar,
    bar width=12pt,
    xlabel={Category},
    ylabel={Value},
    symbolic x coords={A, B, C, D},
    xtick=data,
    legend pos=north west,
    nodes near coords,
  ]
    \addplot coordinates {(A,4) (B,7) (C,3) (D,8)};
    \addplot coordinates {(A,6) (B,5) (C,9) (D,4)};
    \legend{Series 1, Series 2}
  \end{axis}
\end{tikzpicture}