CoinJoin is a method developed by Gregory Maxwell in 2013 that facilitates equal mixing of bitcoins from different users in a single transaction. By doing so, it obscures the linkage between the input and output addresses, making it difficult for observers to ascertain the source and destination of funds. This technique involves multiple participants who create a single transaction with multiple inputs and outputs, containing funds from each participant without revealing how much each one contributed. CoinJoin helps mitigate blockchain analysis techniques often employed by entities seeking to trace cryptocurrency movements, thus enhancing users' privacy.