Stabilizer - various kinds and thicknesses; used to stabilize fabric for embroidery
Webbing - it looks almost like pressed fine fiber. It is used for fusing fabrics together. It takes getting used to because it is wiggly (I detest it, but it has its uses)
Interfacing - fabric with one fusible side, generally used in garment sewing to give more stability to certain parts
Fusible - double sided, sometimes covered with paper on both sides, and sometimes on one side only. I use it for machine and wool appliqué. Comes in many weights depending on the fabric for which it is used.
i hope this gives you a general idea
