here are three basic units in any table: the table itself, the table row, and the table cell. The tags for these are:
Table: <table>
Table row: <tr>
Table cell: <td>
Why do table cells have tags called <td> instead of <tc>? Just to make things more confusing. The tag actually stands for "table data," if you really want to know.
The thing to remember here is that a <td> is always enclosed in a <tr>, which is always enclosed in a <table>.
Enough already. Let's make one and see what this thing looks like.