The flat surface people sit around when they eat together is a table. If you clear the table, I'll do the dishes.
A table can also be a chart full of information. When doing your taxes, you might use a tax table to determine how much you owe. If you “have a seat at the table,” you're involved in a discussion. If an offer is “on the table,” it's up to you to accept or reject it. If you made money “under the table,” don't bother looking that up when you do your taxes.