There are a wide variety of types available so you may need a few different sizes if you are going to be working on different sized pieces of wood.
A clamp will provide stability when you are sawing, chiselling, or applying adhesive to your wood. Clamps are also invaluable if your project involves joining wood together, as they will keep the pieces tightly bound while glue dries, ensuring a strong, precise bond. There are a wide variety of types available so you may need a few different sizes if you are going to be working on different sized pieces of wood.