Electric screwdrivers are electrical tools designed for driving in and removing screws. They simplify and expedite assembly and disassembly in various fields, including construction, repairs, carpentry, and metalworking. Here are the key characteristics and functions of screwdrivers:

1. Motor and Power Source: Screwdrivers typically come with an electric motor and can be corded (connected to an electrical outlet) or cordless (powered by a rechargeable battery). Cordless models offer higher mobility as they do not require a constant power source.

2. Adjustable Speed and Torque: Screwdrivers often feature adjustable speed and torque settings, allowing users to customize the tool based on the specific task and the type of fastener.

3. Bi-directional Operation: Screwdrivers can work both forward for driving screws and in reverse for removing them.

4. Variety of Attachments: They usually come with various attachments and bits that are suitable for different types of screws and fasteners.

5. Ease of Use: Screwdrivers make it easier to work with a large volume of fasteners, reducing physical strain and increasing efficiency.

6. Applications: Screwdrivers find applications in furniture assembly, installation of wall and ceiling structures, window and door fitting, and in various industries where fast and reliable fastening is required.

Screwdrivers are versatile tools that save time and effort when working with fasteners and enable quick and precise completion of various tasks in construction and other industries.