This tag is to be used for questions about the Obfs4 pluggable transport (e.g. such as how it works of if there is an issue in using it).
Obfs4 is a pluggable transport that is used with a bridge to circumvent Tor censorship. It is similar to another pluggable transport, Obfs3 and prevents censors from detecting Tor users. Obfs4 randomizes Tor traffic to stop ISPs from detecting the connection. This is useful in countries such as China and Iran which block connections to the Tor network.