Interlining, lining, and interfacing are all materials that are commonly used in sewing and garment making to provide structure, support, and a finished look to clothing. Here is a brief overview of each and how they are used:

Interlining: Interlining is a layer of fabric that is inserted between the outer fabric and the lining of a garment to add warmth, structure, and durability. It can be made from a variety of materials such as cotton, wool, or polyester and is commonly used in jackets, coats, and other outerwear.

Lining: Lining is a separate layer of fabric that is attached to the inside of a garment to provide a smooth, comfortable interior and to hide seams and construction details. It can be made from a variety of materials such as silk, cotton, or polyester and is commonly used in jackets, dresses, and skirts.

Interfacing: Interfacing is a layer of fabric that is used to add stiffness and structure to the fabric of a garment. It is often used on collars, cuffs, and other areas that require extra support. Interfacing can be made from a variety of materials such as fusible or sew-in interfacing and comes in a variety of weights and stiffness levels.

Overall, using these materials properly can greatly enhance the quality and durability of your garments.