To highlight alternate rows in a table with different colors, use the command

\rowcolors{1}{blue!15}{white}

{2} row number from where alternate colors should start. Row ‘2’ in this case.
{blue!15} start with blue color.
{white} alternate row color is white
Swap the colors, to change the colors ordering.

You have to add ‘xcolor’ package to preamble

\usepackage[table]{xcolor}

Here is an example code for creating alternate row colored table in . You can try online code compilation [here].

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\documentclass[11pt,a4paper]{article}
\usepackage[table]{xcolor}    
 
\begin{document}
  \rowcolors{2}{blue!15}{white}   
  \begin{tabular}{|c | c|}
    \rowcolor{blue!50}              % Heading with different color to highlight it      
    Heading1       & Heading2       \\ \hline
    Row 1 column 1 & Row 1 column 2 \\
    Row 2 column 1 & Row 2 column 2 \\
    Row 3 column 1 & Row 3 column 2 \\
    Row 4 column 1 & Row 4 column 2 \\
    Row 5 column 1 & Row 5 column 2 \\ \hline
  \end{tabular}
\end{document}

Here is the screenshot of the compiled output

But I remember there was an issue when specified that way and did not produce the desired output for me in beamer. The following code worked out for me in a beamer presentation

\documentclass[xcolor=table]{beamer}
\usepackage{xcolor}