What is the rock in Matthew 16:18?

This article has been translated into the following languages:

Afrikaans العربية Bosanski Български 中文 中國話 Deutsch Español فارسی Français Ελληνικά हिन्दी Hrvatski Bahasa Indonesia Italiano 日本語 Kiswahili 한국어 Magyar Nederlands Polski Português Română Русский සිංහල Slovenčina Slovenščina Srpski Suomi Tagalog தமிழ் ไทย Türkçe Українська اردو Tiếng Việt