According to dictionary.com a digital citizen is: a person who develops the skills and knowledge to effectively use the Internet and other digital technology, especially in order to participate responsibly in social and civic activities:
Sources:
https://www.graniteschools.org/edtech/digcit/
https://www.youtube.com/watch?v=toK_BAYnjoU
https://www.teachthought.com/the-future-of-learning/the-definition-of-digital-citzenship/
http://www.dictionary.com/browse/digital-citizen