Some product warranties require the purchaser to fill out a registration card for the warranty to be valid. However, in many cases companies use the registration information for marketing purposes, and the purchaser does not need to fill it out in order to keep the product under warranty.
The law requires companies to inform consumers whether warranty registration is necessary. These cards typically request demographic and lifestyle information that is not actually required for warranty registration. However, when a customer provides his name and contact information, this makes it possible for the company to contact him in the future if there is a product recall.