The shape of sessile liquid drops is accounted for. This is followed by the physics of sticking drops, with rain drops on vertical glass windows or panes, car windscreens and other inclined surfaces as modeled examples. Liquid drops were then considered as sticking agents in light of their ability to stick two parallel flat plates, separated by a small distance, containing them. Thereafter, non-sticking drops were presented with Leidenfrost drops as typical examples and their shape, stability, evaporation, self-propulsion, deceleration and trapping were discussed. Finally, non-coalescence drops were discussed and liquid marbles as typical examples were briefly considered, giving way for the detail discussion given in Chapters 4 and 5.