A computer understands the digital signal but to accept or transmit the analog signal first computer converts them into digital format than apply further processing. Analog signals are continuous in nature such as human voice, waves of water.

Analog results are not accurate as compared to digital calculation. Even they are slower in speed relatively to digital signals. Setting up an analog computer required scale factors to be chosen, along with initial conditions—that is, starting values.

Another essential was creating the required network of interconnections between computing elements. Sometimes it was necessary to re-think the structure of the problem so that the computer would function satisfactorily.

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The computer mouse as we know it today was invented and developed by Douglas Engelbart, with the assistance of Bill English, during the 1960’s and was patented on November 17, 1970