There is the paper piecing technique where the paper is used as the foundation for the quilt block. I always simply called it "paper piecing" but it may have another more high-tech name.
EPP means English paper piecing , which is generally hand sewn with paper templates. Here's a YouTube video on it.
https://m.youtube.com/watch?v=68VRD_0OcSM
I have never done EPP, but I love the results and admire those who are brave enough for the challenge!