Conductivity

Q1: What is conductivity?
A1: Conductivity is how well a material conducts current.

Q2: Why should I care about conductivity?
A2: Many electronic devices owe their properties to the conductivities of the different materials from which they are made up of.

Q3: How do I categorize these materials of different conductivities?
A3: Starting at the two extremes, a conductor conducts well while an insulator conducts poorly. A semiconductor, as the name suggests, has a conductivity between an conductor and insulator.