In computer field, hardware indicates all of the physical parts of a computer, as distinguished from the data it contains or operates on, and the software that provides instructions for the hardware to accomplish tasks. The boundary between hardware and software is slightly blurry. For example, firmware is software that is "built-in" to the hardware. Firmware is usually the province of computer programmers and computer engineers in any case and not an issue that computer users need to concern themselves with. Computer hardware typically consists chiefly of electronic devices (CPU, memory, display) with some electromechanical parts(keyboard, printer, disk drives, tape drives, loudspeakers) for input, output, and storage, though completely electronic (mechanical,electromechanical, hydraulic, biological) computers have also been conceived of and built.