The difference between these two measuring spoons is that a teaspoon is equal to 1/6 of a fluid ounce (5mL), and a tablespoon is equal to 1/2 of a fluid ounce (15mL). This makes a tablespoon three times the size of a teaspoon. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.