The determination, analysis and modelling of temporal mass variations within the Earth system are one of the main scientific objectives in the Earth science-related disciplines. The Gravity Recovery and Climate Experiment (GRACE) satellite mission, launched in March 2002, with its pioneering observation technology provides valuable data for the determination of temporal variations of gravity/mass functionals (TVGMFs). The GRACE satellite mission was operated for three times longer than its initial planned duration. In October 2017, GRACE satellites ran out of fuel, and the mission was terminated. However, it emphasizes the need for the GRACE Follow-On (GRACE-FO) satellite mission, which has been launched on 22^nd May 2018, for a long-term sustainable information on TVGMFs. The main aim of this presentation is to discuss the determination, analysis and modelling of TVGMFs from GRACE/GRACE-FO satellite missions. It is also devoted to demonstrate TVGMFs results obtained over the area of Poland.