What is the meaning of Stacking?

The act by which something is stacked.

Sport stacking.

A stacked arrangement of often aromatic molecules, adopted due to interatomic interactions.

Making claims for a single incident on multiple insurance policies.

An image processing technique to reduce noise or add special effects.

A technique for keeping a captive audience by grouping together programs with similar appeal.

present participle and gerund of stack

Source: wiktionary.org