If something is biodegradable, then, given the right conditions and presence of microorganisms, fungi, or bacteria, it will eventually break down to its basic components and blend back in with the earth. Timeline is not very specifically defined and the term biodegradable is very often misused in marketing and advertising of products and materials that are not actually environmentally friendly. Opposite to non-biodegradable.
The papers from Lessebo Paper are fully biodegradable.