{
) character, followed by the command to
change the defaults, and ending with the close brace }
character.
For example, to make appear in a larger font, you could type
{\Large larger font}
. This limits the
scope of the large command to the environment within the braces.
An environment can also be delimited with a begin-end pair. This is quite useful for larger sections of text. For example, to center multiple lines of text,
you could use the following lines:
\begin{center} like\\ these two, \end{center}
Note the \\
following the first line. This is a
command which tells LATEX to break the line at that point, rather
than filling the text completely between the two margins like it
normally does. This allows you to force lines to end when you want
them to, rather than when LATEX wants them to.