Tables are defined with the tabular environment. It has an
argument that specifies the number of columns and their
formatting. In the simplest case it contains a letter for each
column, specifying the alignment as
l
left-aligned
r
right-aligned
c
centered
A table with 3 columns, first one centered, the other two right-aligned:
\begin{tabular}{crr}
The body of the table is given by a line of rows, seperated by \\.
Each row contains an item for each column, separated by &.
The simple table above, defining the alignment letters, was produced with:
\begin{tabular}{ll}
l & left-aligned \\
r & right-aligned \\
c & centered
\end{tabular}