Five traits , you have chosen while creating Sim create his or her character and personality. According to the traits different interactive options are available and he or she can do some things better and faster (or slower). For example special interactions are available during a conversation , which can appear if Sim possesses particular traits such as being a family man or friendly or grumpy etc. Other traits influence the speed of learning and performing some tasks such as ex. cooking or working manually. There are more than 60 traits so there are even more possible combinations. Thanks to it every Sim is different. These traits may influence Sim's mood in a positive or negative way in particular situations [read the chapter on moodlets].