Snowflake is a system that allows people from all over the world to access censored websites and applications. Similar to how VPNs assist users in getting around Internet censorship, Snowflake helps you avoid being noticed by Internet censors by making your Internet activity appear as though you're using the Internet for a regular video or voice call.
I have a friend from Iran. He used to use tor to access free information and to communicate without surveillance. It's important infrastructure for him