Tarun: Could you please explain the role of dispositor in a chart?

There are few kinds of dispositors. That important tool is especially used in Tulya (mixing rasi with Varga) concept and Dasas (especially in Udu). For nodes this tools matters more than for other grahas/arudhas as they are chaya grahas and take energy from other grahas (like Durga takes weapons). Its also important for Upagrahas. Important dispositors have their own names, Moon dispositor is called Subhapati, while Surya Dispositor is called Aditya. Nakshatra dispositor (Jeeva) shows sustanence source and focus of mind. Arudha dispositor always shows level of influence/resource and defines the arudha (especially if arudha is empty).

For shortcut we can say that dispositor generally shows resources and creation. If it is connected to yoga then it indicate third person (need of connection/activation through additional person).