Tack is a small, sharp fastener used to hold things together, often made of metal. It has a flat head and a pointed end, making it easy to push into surfaces like wood or cork. People commonly use tacks for hanging pictures, organizing notes, or securing fabric. They come in various sizes and colors, making them versatile for different projects. In addition to its use as a fastener, "tack" can also refer to a specific type of sailing maneuver. In sailing, tacking is the process of changing direction by turning the bow of the boat into the wind. This technique helps sailors navigate effectively and maintain speed while sailing against the wind.