Hi there

Hybrid orbitals are a bonding scheme or model of orbitals, experimentally determined to match what actually happens in bonding. Hybrid orbitals are hybrids, or a mix, or atomic orbitals.

Unhybridized orbitals are the regular atomic orbitals that we have always known. Hybridized orbitals are orbitals that represent a mixture of unhybridized orbitals. These orbitals show what actually happens in bonding and help determine the molecular shape.

a sigma bond is made up of hybridized orbitals and a pi bond is made up of unhybridized orbitals

Hope this helps.