The Samsung Galaxy Tab series of tablet computers use a micro USB port for charging. It shares this trait with many smartphones and other tablets that are not manufactured by Apple.
Many tablets, including Samsung Galaxy tablets, do not feature standard USB ports. However, adapters are made that make it possible to turn Samsung tablets into USB hosts. These can be used to access files from USB flash drives, and to plug other devices such as cameras or external hard drives in to the tablet. These types of adapters are made by Samsung as well as by many other electronics manufacturers.