Binary options have been withdrawn for retail traders by the European regulator, ESMA. Brokers not regulated in Europe may still offer binaries to EU clients.
It is also possible for EU traders to nominate themselves as professional traders. This waives their rights to regulatory protection, and means binaries are free to be used again.
Some synthetic markets can also be traded by EU traders, and while the product works exactly as a binary options, they are referred to slightly differently.