The terms of single bet and combined bet refer to the number of selections you will make in the same bet. If the single bet is safer, the combined bet offers you a greater profit opportunity.
Single Bet is 1 bet for 1 selection for an event. The selection must be winning to generate a win.
You decide to bet 100 $ at best gambling sites on the draw between Juventus and Inter Milan counting for the football championship in Italy.
This is a simple bet because you bet on only one possible outcome of a single event.