An interjection is a word or phrase that shows strong feeling or emotion. Examples of interjections include "wow," "oh," "ouch," and "yay." They are often used to express surprise, excitement, pain, or other intense emotions. If you want to learn more about interjections, you can visit websites like www.dictionary.com or http://grammar.ccc.commnet.edu/grammar/interjections.htm which provide definitions, examples, and further explanations.