Yerka is a project that resulted in the development of "the first theft-proof bike", according to Yerka Bikes website. So, other kinds of bikes don't have the ability to lock themselves down and it also offers other things such as Bluetooth connection, which is another big difference.
The genius behind Project Yerka's design is simple. The frame disassembles to act as the bike's own lock by dividing the middle pipe and attaching it to the removable seat. Like any lock, all that's required is a post to fasten it to. Unlike any lock, this thing is foolproof. The only way to steal this bicycle is to break its frame, which defeats the purpose.
