A tool is an implement or simple device designed to make completing a task or performing a particular kind of work easier. Tools are an integral part of our daily lives. They come in all shapes and sizes and are used to achieve a variety of goals. A wrench helps in repairing cars or building and maintaining machinery. Hammers and screwdrivers are common carpenter’s tools. Pencils help us write. Rulers help us measure. Hair dryers, microscopes, welders, pulleys, computers and cell phones are all tools used everyday to help accomplish tasks more easily.