Measuring Cups
1 Cup
"1 Cup" is equal to 8 fluid ounces in US Standard Volume. It is a measure often used in cooking.
A Metric Cup is slightly different: it is 250 milliliters (which is about 8.5 fluid ounces).
Ounces (at 8 oz per cup) 
milliliters (at 250 ml per cup) 
Tablespoons (at 16 Tbs per cup) 


¼ cup  2 oz  62.5 ml  4 Tbs 
½ cup  4 oz  125 ml  8 Tbs 
¾ cup  6 oz  187.5 ml  12 Tbs 
1 cup  8 oz  250 ml  16 Tbs 
1 ¼ cup  10 oz  312.5 ml  20 Tbs 
1 ½ cup  12 oz  375 ml  24 Tbs 
1 ¾ cup  14 oz  437.5 ml  28 Tbs 
2 cups  16 oz  500 ml  32 Tbs 
Measuring Cups
But there are also measuring cups, which are things used to measure liquids, or powders like flour or sugar.
As you fill up the measuring cup, you need to look at which number it is filled to.
Here we have 2/3 cup (twothirds of a cup) of milk.
And they can also measure milliliters (ml):
Here we have 150 ml.
It doesn't say "150" ... it says "50" ... but it is halfway between 100 and 200 so you can figure out it is 150 ml.
There are also special ones designed to hold an exact amount, such as these 1/2 cup and 1/4 cup measures.
They can also hold more than "1 Cup" of liquid.
This measuring cup holds up to 4 cups of liquid. If the liquid goes all the way to the 3, then there are 3 cups of liquid. Between the numbers, you would find fractions of a cup.
2 cups of a liquid is the same thing as 1 pint. So this measuring cup also holds 2 pints (4 cups equals 2 pints).