# Conductance and conductivity

What is the relationship between conductance and conductivity? Is there any formular that can explain their relationship? I am so confused.

$$G=\sigma \frac A l$$
where $G$ is the conductance, $σ$ the conductivity, $A$ the cross-sectional area perpendicular to the direction of electric current, and $l$ the length of the conductor. This formula applies for any (geometrically) prismic or cylindrical conductor, including cuboids.