Final answer:
An encoder is a device used to measure the position or location of a discontinuity by converting physical displacement into an electrical signal. It can provide information about the length, width, or shape of the discontinuity.
Step-by-step explanation:
An encoder is a device used to measure and determine the position or location of a discontinuity. It does this by converting the physical displacement of an object into an electrical signal. The encoder can provide information about the length, width, or shape of the discontinuity depending on its design and application.