As part of the Second Vatican Council, the Church formulated a permanent synod of bishops that would consult in a collegial way with the pope. A synod does not rule on doctrinal matters but does serve as in an advisory basis to the pope.
Beginning in October, Pope Francis will convoke a synod of the entire Church on synodality that is, how Catholics can better live in communion with one another and promote the Gospel to the entire world. This synod is unique because it begins at the “ground floor” of the Church in local dioceses led by their bishops.
The Vatican has prepared a Synod 2021-2023 website to help Catholics--including high school students--learn about and participate in the events of this synod.