Pop-Tarts is a brand of toaster pastries produced and distributed by Kellogg's since 1964, consisting of a sweet filling sealed inside two layers of thin, rectangular pastry crust. Most varieties are also frosted. Although sold pre-cooked, they are designed to be warmed inside a toaster or microwave oven. They are usually sold in pairs inside Mylar packages and do not require refrigeration.
Pop-Tarts is Kellogg's most popular brand to date in the United States, with millions of units sold each year. They are distributed mainly in the United States, but also in Canada, the United Kingdom, Ireland, Australia and New Zealand.
Pop-Tarts are produced in dozens of flavors, plus various one-time, seasonal, and "limited edition" flavors that appear for a short time.