tabular

 \begin{tabular}[pos]{cols}
 column 1 entry & column 2 entry ... & column n entry \\
 .
 .
 .
 \end{tabular}

 \begin{tabular*}{width}[pos]{cols}
 column 1 entry & column 2 entry ... & column n entry \\
 .
 .
 .
 \end{tabular*}

These environments produce a box consisting of a sequence of rows of items,aligned vertically in columns. The mandatory and optional arguments consist of:

width Specifies the width of the tabular* environment. There must be rubber space between columns that can stretch to fill out the specified width.
pos Specified the vertical position; default is alignment on the center of the environment.
t - align on top row
b - align on bottom row
- cols Specifies the column formatting. It consists of a sequence of the following specifiers, corresponding to the sequence of columns and intercolumn material.
l - A column of left-aligned items.
r - A column of right-aligned items.
c - A column of centered items.
| - A vertical line the full height and depth of the environment.
@{text} - This inserts text in every row. An @-expression suppresses the intercolumn space normally inserted between columns; any desired space between the inserted text and the adjacent items must be included in text. An \extracolsep{wd} command in an @-expression causes an extra space of width wd to appear to the left of all subsequent columns, until countermanded by another \extracolsep command. Unlike ordinary intercolumn space, this extra space is not suppressed by an @-expression. An \extracolsep command can be used only in an @-expression in the cols argument.
p{wd} - Produces a column with each item typeset in a parbox of width wd, as if it were the argument of a \parbox[t]{wd} command. However, a \\ may not appear in the item, except in the following situations: (i) inside an environment like minipage, array, or tabular, (ii) inside an explicit \parbox, or (iii) in the scope of a \centering, \raggedright, or \raggedleft declaration. The latter declarations must appear inside braces or an environment when used in a p-column element.
*{num}{cols} - Equivalent to num copies of cols, where num is any positive integer and cols is any list of column-specifiers, which may contain another *-expression.