Two Types of Orthodox Judaism

 https://www.torahmusings.com/2011/07/two-types-of-orthodox-judaism/

To be sure, every movement, religious or otherwise, needs a level of hischadshus, innovation. But this problem is solved by the idea of Gedolim, the leaders and halakhic decisors who are the arbiters of the tradition and who determine what is and what is not considered an authentic part of Judaism. When the Gedolim, the masters of the mesorah, give their imprimatur to an innovation, the innovation becomes justified and validated.