In mathematics, the canonical bundle of a non-singular algebraic variety over a field of dimension is the line bundle
which is the nth exterior power of the cotangent bundle Ω on V. Over the complex numbers, it is the determinant bundle of holomorphic n-forms on V. This is the dualising object for Serre duality on V. It may equally well be considered as an invertible sheaf.
The canonical class is the divisor class of a Cartier divisor K on V giving rise to the canonical bundle — it is an equivalence class for linear equivalence on V, and any divisor in it may be called a canonical divisor. An anticanonical divisor is any divisor −K with K canonical. The anticanonical bundle is the corresponding inverse bundle ω−1.
Read more about Canonical Bundle: The Adjunction Formula, Singular Case, Canonical Maps
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—Henry David Thoreau (1817–1862)