Just as hardware stores sell physical supplies and tools for building and fixing things, so there are physical computer and networking parts called “computer hardware”. Computer software is information and instructions for doing things in virtual, non-print, digital form that cannot be physically touched. People interact with computer software indirectly when using a computer. Software is stored on (or in) and moves through computer hardware as electrical symbols or signals called binary code that signify “on” or “off”. Binary is more complex but kind of like Morse code that uses dashes and dots or short and long signals. Along with electricity, computer hardware and software both are required to use a computer. Either computer hardware or computer software without the other is useless. Repairing or replacing computer hardware requires different skills and tools than repairing or replacing computer software.