A binder, also known as a binding agent, refers to any substance or material that effectively consolidates or attracts other materials, resulting in the formation of a unified whole. This cohesion can occur through various mechanisms such as mechanical, chemical, adhesion, or cohesion. Specifically, binders encompass liquid or dough-like substances that undergo a chemical or physical transformation, ultimately solidifying and securely adhering fibers, filler powders, and other particles introduced into them.