Chocolate chips are small chunks of chocolate. They are often sold in a round, flat-bottomed teardrop shape. They are available in numerous sizes, from large to miniature, but are usually around 1 cm in diameter. Many sizes are available depending on preference.Chocolate chips are a required ingredient in chocolate chip cookies, which were invented in 1933 when Ruth Graves Wakefield of the Toll House Inn in the town of Whitman, Massachusetts added cut-up chunks of a semi-sweet Nestlé chocolate bar to a cookie recipe. The cookies were a huge success, and Wakefield reached an agreement with Nestlé to add her recipe to the chocolate bar’s packaging in exchange for a lifetime supply of chocolate. Initially, Nestlé included a small chopping tool with the chocolate bars, but in 1939 they started selling the chocolate in chip (or “morsel”) form. The Nestlé brand Toll House cookies is named for the inn.