What is the difference between the processes of phagocytosis and pinocytosis? what are their similarities?

Both pinocytosis and phagocytosis are types of endocytosis. Endocytosis is the process by which cells absorb molecules. These molecules often include proteins and other substances that are essential for the existence of the cell. The endocytosis process is used by all cells because the molecules are large, polar molecules that cannot pass through hydrophobic plasma or cell membrane.
Pinocytosis is the absorption of fluids, while phagocytosis is the absorption of solid objects, which are essentially food for the cell. Almost all cells perform pinocytosis, but phagocytosis is performed only by specialized cells that protect tissues by engulfing bacteria, cellular debris, and other abnormal materials.