What is a "seam ripper"?

A seam ripper is a small tool that is used to remove unwanted seams, stitches, and thread from a piece of fabric. It typically consists of a small handle and a sharp, pointed blade that is used to cut through the stitches of a seam, allowing the seam to be easily pulled apart. Seam rippers are commonly used in sewing and quilting projects when a mistake has been made or when alterations need to be made to a garment. They can also be used to remove unwanted hems, pockets, or other features from a piece of fabric. Seam rippers come in a variety of shapes and sizes, and can be made from metal or plastic.