Fusible web is a humanmade fiber that will melt when heated. When placed between two pieces of fabric, the melting action of the fusible web causes it to fuse the two fabrics together. It is not woven or knitted. It's used to make fabrics stiffer, and it's especially effective for mending hems and small holes.
Tear-away stabilizers are temporary stabilizers that are easily removed once you have stitched out an embroidery design. This is most likely what you will use when embroidering on towels, scarves and regular woven fabrics. Tear-Away embroidery backings are the of choice for most embroiderers using stable fabrics. Tearaway stabilizers enable removing extra backing faster, cheaper, and safer than using backing that must be cut away with scissors.