What are the main differences between the Orthodox and Catholic Churches?

There are several differences between the Christian and Catholic churches. The most important, in my opinion, is that the Orthodox Church is divided into several different branches, for example, the Russian Orthodox Church, the Ukrainian one, and so on. But the Catholic Church is united all over the world with a single ruler – the Pope. In the Catholic Church, the Holy Spirit comes from father and son, but in the Orthodox Church it comes exclusively from the father. Also, the Catholic Church prohibits divorce, and in the Orthodox it is allowed in some cases.