A giveaway is a type of marketing promotion where something is given away for free. Companies often use giveaways to spread the word about their products, to make themselves more memorable in their customers' minds, or to get people to try something new in the hopes that they will continue to buy the product. See Susan Friedman, the Advertising Guide's, article 10 Tips to Use Giveaways Effectively
for more information about marketing with giveaways.
Sweepstakes, contests, and freebies all fall under the designation of a giveaway.