Three branches are a useful but simplified grouping
Кентерберійський собор — англіканський приклад християнської архітектури; не зображення всіх церков світу / Canterbury Cathedral, an Anglican architectural example; not an image of every Christian church. Credit: ECetc Church Photos; CC BY-SA 4.0. https://creativecommons.org/licenses/by-sa/4.0 Source: https://commons.wikimedia.org/wiki/File:Canterbury_Cathedral%2C_Kent_(exterior).jpg
Catholicism, Orthodoxy and Protestantism are often used as broad Christian groupings. This scheme does not capture every historical distinction: the World Council of Churches distinguishes Eastern and Oriental Orthodox traditions and the Assyrian Church of the East. Broad groups also contain different churches; the classification is not a list of three equivalent institutions.