A blender, or liquidiser is a kitchen appliance used to mix ingredients or puree food. The term typically refers to a stationary, upright electrical device, which is to be distinguished from a hand-powered or electric mixer that may be used for similar purposes. The blending container can be made of glass, plastic, or stainless steel, and often has graduated markings for approximate measuring purposes. At the top of the container is a lid to prevent ingredients from escaping during operation. At the bottom is a blade assembly, sometimes removable for cleaning purposes. In cases where the blades are removable, the container should have an o-ring between the body of the container and the base to seal the container and prevent the contents from leaking.Some of the functions of blenders have been taken over by food processors. In particular, thicker mixtures such as mayonnaise and hummus are easier to make in food processors.