Promotional merchandise, promotional items, promotional products, promotional gifts, or advertising gifts, sometimes nicknamed swag, are articles of merchandise (often branded with a logo) used in marketing and communication programs. They are given away to promote a company, corporate image, brand, or event. These items are usually imprinted with a company's name, logo or slogan, and given away at trade shows, conferences, and as part of guerrilla marketing campaigns.
* The word Shwag is also a slang term for low grade marijuana but I was refering to the description above, pardon the spelling error.