  We study the concept of extended derivations of algebras which expands
diverse definitions of generalized derivations given in the literature. We
concentrate on the family of the anti-commutative algebras and classify such
spaces of derivations by considering a suitable notion of equivalence when we
restrict attention to such algebras. Afterwards, we investigate a link between
the well-known $(\alpha,\beta,\gamma)$-derivations and some new extended
derivations obtained in the above-mentioned classification. Finally, we present
applications of extended derivations to study degenerations of algebras.
