An interference fit is a type of assembly where two parts are joined together with a tight fit, resulting in a slight overlap in their dimensions. This method ensures that the parts remain securely connected without the need for additional fasteners. It is commonly used in mechanical engineering to create strong connections between components, such as shafts and bearings. In an interference fit, the inner part is slightly larger than the outer part, creating a force that holds them together when assembled. This technique is often applied in applications involving machinery, automotive components, and aerospace engineering, where reliability and strength are crucial.