Audio commentary. An audio commentary is an additional audio track, usually digital, consisting of a lecture or comments by one or more speakers, that plays in real time with a video. Commentaries can be serious or entertaining in nature, and can add information which otherwise would not be disclosed to audience members.
absorption costing. a method of inventory costing in which all variable manufacturing costs and all fixed manufacturing costs are included as inventoriable costs.
Fixed costs often include rent, buildings, machinery, etc. Variable costs are costs that vary with output. Generally variable costs increase at a constant rate relative to labor and capital. Variable costs may include wages, utilities, materials used in production, etc. In accounting they also often refer to mixed costs. These are simply costs that are part fixed and part variable.