Advertisements are the price paid by ordinary slobs for getting to watch TV for free. (Aside from the enormous amounts charged by greedy cable companies, anyway.) They usually manifest as 30- or 60-second barrages of slick imagery and/or good-looking actors pretending to be ordinary people using desirable household products. Increasingly few viewers pay attention to them, except during certain sporting events.
The lucky bastards who can afford a TiVo are largely exempt from having to endure advertisements.