Digital devices have many advantages over their analog counterparts. The first advantage is that they can detect noise, or incidental signals that could interfere with the intended message. Not only can they detect noise, digital devices can correct the mistake. Analog devices are not able to do this, so when a stray signal enters the stream, it eventually compounds and gets worse. The simplest example of this is a telephone. An analog telephone transmits electrons from one phone to another. Electrons lose power because some of their energy turns to heat, so they use analog amplifiers which restrengthens the signal. When unintentional signals (noise electrons) mix with the intended electrons, the amplifier picks these up too and cannot detect that they are not a part of the original message. The amplifier picks up the noise and amplifies it, so by the end most of what the other person hears is noise, or static. Digital telephones estimate the wavelength of a signal using an analog to digital converter, which eliminates the issue of noise.
