Well, I have a series of possible answers. Choose the one you like (some of them use the package booktabs
, as you can see in the code:
\documentclass[12pt,a4paper]{article}
\usepackage{array}
\usepackage{booktabs}
\begin{document}
\begin{table}
\centering
\caption{Your caption here}\label{tab:yourlabel}
\begin{tabular}{l|lll}
\toprule
\textbf{Hola1} & \textbf{Hola2} & \textbf{Hola3}\\
\midrule
datum1 & datum2 &datum3 &etc\\
datum4 & datum5 &datum6 &etc\\
%\midrule
datum7 & datum8 &datum9 &etc\\
\bottomrule
\end{tabular}
\end{table}
\begin{table}
\centering
\caption{Your caption here}\label{tab:yourlabel}
\begin{tabular}{l|lll}
\toprule
\textbf{Hola1} & \textbf{Hola2} & \textbf{Hola3}\\
\hline
datum1 & datum2 &datum3 &etc\\
datum4 & datum5 &datum6 &etc\\
%\midrule
datum7 & datum8 &datum9 &etc\\
\bottomrule
\end{tabular}
\end{table}
\begin{table}
\centering
\caption{Your caption here}\label{tab:yourlabel}
\begin{tabular}{l|lll}
\textbf{Hola1} & \textbf{Hola2} & \textbf{Hola3}\\
\hline
datum1 & datum2 &datum3 &etc\\
datum4 & datum5 &datum6 &etc\\
%\midrule
datum7 & datum8 &datum9 &etc\\
\end{tabular}
\end{table}
\end{document}
They produce this:

tabular
environment. – AlexG Jun 21 '13 at 12:03