Snowflake is a system to defeat internet censorship. People who are censored can use Snowflake to access the internet. Their connection goes through Snowflake proxies, which are run by volunteers. For more detailed information about how Snowflake works see documentation wiki.
If your internet access is not censored, you should consider installing the Snowflake extension in Firefox or Chrome to help users in censored networks, such as in Russia and possibly in Ukraine, should Russia gain control of their infrastructure. There is no need to worry about which websites people are accessing through your proxy. Their visible browsing IP address will match their Tor exit node, not yours.
You can also simply click the “Enabled” button above to start helping.