Which type of research reference do you use when rephrasing the original text without condensing it?
direct quote
paraphrase
summary
citation

The correct answer among all the other choices is Paraphrase. This is the type of research reference you use when rephrasing the original text without condensing it. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help. 

People worry about it mostly because when people plagiarize, they are copying someone else's written work and are not giving credit to that person or quoting them. I think of it as literary theft. 
Hope I helped. :)