Class is something that acts as  a template to represent object properties and behaviour. For example, let us consider a real world object car. This object may contain properties like color, speed, model name and so on. It may have behaviours like accelerate, brake and so on.
Syntax

class className:SuperClass,ConformingProtocol1,..ConformingProtocoln{
   //variables and methods
}

Example

class Car:Vehicle,DrivingProtocol{
var turbo:String
func addTurbo(){
//Add turbo
}
}