some companies have their own transport to pick and drop their workers/employers from their residences to work places in between city of dubai or even if u r some out side from dubai... also public busses available for almost all routs to travel intercity.. but these public busses takes much time due to long routs... so it is better that u can higher a taxi if u want to save ur time... also u can drive ur own car if u have a UAE driving licence... and if u want to visite here for limited period of days and u need to travel more in this period then u can higher Rent a car too (with or without driver)
i hope u have understood the all transportation system in dubai... but if u still have any confussion then u may ask again ..... hope for all the best