Pre-heat oven to 200*, line baking sheets with parchment paper or silpat, (silicone baking sheet). That's what I use.
In a clean, grease free mixing bowl, whip whites on low speed until foamy.
Add cream of tartar and continue whipping about 8 minutes or so, the whites should begin to have soft peaks.
Add vanilla and gradually add sugar, a few teaspoons at a time and continue beating until the whites are stiff and shiny like satin.
Either use a pastry bag to pipe out shapes or drop by tablespoons on prepared sheets.
Bake for about 1 1/2 hours at 200* Fahrenheit. Turn off the oven and leave the door ajar until they are completely cooled.
When they are done, they will be crispy and light and will be easily removed from the cookie sheet.
The amount you make depends on the size, you can make big giant meringues or little button sized meringues. Store in an airtight container. They do not need to be refrigerated.