Because those addresses are long and complex, you will often encounter an @OpenAlias address instead. For example, Monero donations can be sent to [email protected] or donate.getmonero.org.
The address is actually the concatenation, in Base58 format, of the *public* @spend-key and the *public* @view-key, prefixed with the network byte (the number 18 for Monero) and suffixed with the first four bytes of the Keccac-256 hash of the whole string (used as a checksum).