LaTeX provides many environments for delimiting certain behavior.
An environment begins with \begin and ends with \end,
like this:
\begin{environment-name}
...
\end{environment-name}
The environment-name at the beginning must exactly match that at
the end. For instance, the input
\begin{table*}...\end{table} will cause an error like:
‘! LaTeX Error: \begin{table*} on input line 5 ended by
\end{table}.’
Environments are executed within a group.