What tool is primarily used to fasten screws into wood?

The primary tool used to fasten screws into wood is an electric screwdriver or drill. This tool is specifically designed for driving screws efficiently and effectively into various materials, including wood. The electric mechanism provides the necessary torque to drive screws without excessive manual effort, making the process faster and allowing for consistent results.

Using an electric screwdriver or drill also has the added benefit of being able to adjust the speed and torque settings, which helps to prevent overdriving screws and damaging the wood. The chuck of the drill can accommodate different sizes and types of screw bits, enhancing versatility for various fastening tasks.

In contrast, a hammer is primarily used for driving nails into wood rather than screws. A wrench is designed for turning nuts and bolts, and a saw is used for cutting materials, not fastening them. Therefore, the electric screwdriver or drill is the most suitable tool for the task of fastening screws into wood.