A binary option is a financial option in which the payoff is either some fixed monetary amount or nothing at all.
Profit varies from broker to broker, some offer 88% payout on a single investment while other offers 92% payout and it also varies from day time to night time.
Two brokers I could recommend easily and they are secured are IQ option and Ayrex. Both are good and reliable brokers.
If you like to hire professional trader to manage your account. You could consider me also.
I know people who make $1000/day and it's legit and legal.
Hope it helps.
God bless all.