Monastic silence means that people who live in monasteries (places for people who want to become closer to God) don't talk, even to each other! This is so they can focus on their spiritual life and become closer to God. Usually, people who do this live in their own rooms, and try to spend lots of time praying, reading, and studying. Sometimes they use sign language to communicate with each other, and there are special rules about when and how you can talk. This all helps the people in the monastery stay focused, so they can better understand God's message.