A blender is a kitchen appliance typically used to mix, purée, or emulsify food and other substances. Blenders rely on the friction between their blades spinning at high speeds and the food itself to chop, grind, or liquefy ingredients. Over time, this friction can cause the blades to dull or even break. Additionally, the gaskets that seal the blade assembly to the pitcher can degrade, allowing leaks and ultimately leading to motor failure. To keep your blender working properly for as long as possible, it's important to clean it regularly and replace any worn out parts.