"I look at having a line of cards as another extension of being a host; helping you wish your loved ones well, piggybacking on your birthday greetings," DeGeneres said in a statement.
Common ways include piggybacking on email attachments sent by associates who may not know that their own computers are infected.
Companies can also try to a obtain larger market share by piggybacking their advertising onto another company's e-mails in order to attract new customers.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.