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For the last few years Mobile adhoc network is getting publicity due to its versatile applications. There are many factors that impact the performance evaluation of mobile networks. A mobility model is one of the factors affecting network in a very significant way. A mobility model dictates the movement of the nodes within the network. This research aims to study several mobility models that represent mobile nodes whose movements are independent of each other (i.e., entity and group mobility models), and determine their characteristics, weakness, and strengths. Offering more insight into these models will help researcher deciding upon a mobility model to use in the simulation. In order to illustrate how the choice of the mobility models impact the performance results of ad hoc protocols to be simulated, this paper will perform a comparison between these models considering several performance metrics like packet delivery ratio, end-to-end delay and normalized routing load and dropped packets