The term "insole" refers to the cushioned layer that sits inside a shoe, providing support and comfort to the feet. However, there are several synonyms for the word, including footbed, insert, liner, cushion, and padding. These terms are often used interchangeably to describe the same thing, but each has slightly different connotations and applications. For example, a footbed typically refers to a specialized insole designed for orthopedic support, while a liner is a thin layer of material that lines the inside of a shoe. Regardless of the specific term used, the function of an insole is the same: to enhance the comfort, fit, and function of a pair of shoes.