Yes, you have given a nice, concise definition
of electrical conductivity. This applies to
metals, which are described as having a “sea”
of electrons that move and flow easily around the
positively charged atom cores. It also applies
to semiconductors, which are so called because
they have some closely bound electrons in the
“valence band” and some loosely bound electrons in
the “conduction band.” The conduction band
electrons are the ones that contribute to the
overall conductivity of the material.
Semiconductors include materials like silicon,
which is used in computer chips and solar cells.