Snips and shears are both cutting tools, but they differ in design, purpose, and application. 
Snips, often referred to as tin snips, are hand tools used for cutting sheet metal and other tough materials. They resemble scissors but are specifically designed to handle the rigors of cutting metal. Snips come in various types, including straight-cut, left-cut, and right-cut, each designed to make different types of cuts. They are typically smaller and more precise, making them ideal for detailed work and cutting curves or intricate shapes in metal.
Shears, on the other hand, are larger cutting tools that can be used for a variety of materials, including fabric, paper, and metal. They are designed for making long, straight cuts and are often used in industrial settings. Shears can be manual or powered, with some models featuring long handles for increased leverage. This makes them suitable for cutting thicker or more rigid materials. In the context of metalworking, shears are often used for cutting large sheets of metal into smaller, more manageable pieces.
In summary, the primary difference lies in their size, design, and intended use. Snips are smaller, more precise, and suited for detailed work, while shears are larger, more robust, and designed for making long, straight cuts in various materials.