Why do graduate students learn to write "Literature review" in academic writing?

It is very important for Teachers to explain why students need to learn 'writing a literature review'. I wonder how many graduate students are aware of asking themselves about the importance of conducting ' a literature review' on a specific topic. I never thought also this. During facilitating students' writing, one day I asked one student, "Why are you learning to write a dissertation?" Student was very surprised to hear this question. Then student answered that I had never thought that. Student again told, “I need to submit a dissertation to the graduate school, if I would like to be an PhD. graduate.” I asked as a writing facilitator, "Would you agree with me, if I say that you write dissertation to share your research during your PhD. life with graduate school". Student answered, "Yes, I am completely agree with you." Likewise, literature review is one the foundation parts to understand the concept of the research and also recognize the current demand of the specific concept. Planning for a good literature review, a student needs to know three writing techniques: 1) Summarize, 2) Paraphrase, and 3) Synthesize. Summarize means: when you are writing the main ideas of a paragraph by collecting similar words and phrases. Paraphrase means: when you are sharing the idea or anything in your own words from that paragraph. Synthesize means: when you are only selecting the points from that paragraph if anything is matched with your research interest.

In a word, students’ literature review help them to learn  about the topic, find the gaps and limitations in the field of interest, and create new questions for the possible new research inquiry.