An interjection is a word or phrase used to express a feeling or to request or demand something. While interjections are a part of speech, they are not grammatically connected to other parts of a sentence. Interjections are common in everyday speech and informal writing.

In the early part of the 21st century, the concept of the computer in education has broadened, largely due to the proliferation of portable digital technologies, in particular tablet devices and smartphones, which can access the internet and run applications (see, for example, Hwang and Tsai 2011; Martin and Herzberger 2013).