What is the brief description of Catholicism?

Catholicism and its adjectival form Catholic are used as broad terms for describing specific traditions in the Christian churches in theology, liturgy, doctrine, spirituality and ethics. "Catholicism" and "Catholic" in this sense refer to the practices of several Christian churches. This sense is to be distinguished from the use of these words to refer to the Roman Catholic Church, that which is in full communion with the Holy See, as well as the Eastern Orthodox Church, which also considers it self the universal and apostolic church.