What is phagocytosis? What does it involve?

Phagocytosis is a process by which a cell can transport substances across the cytoplasmic membrane and into the cytoplasm. Cells that are capable of phagocytosis are collectively known as phagocytes and include neutrophils, eosinophils, and macrophages. Phagocytosis is part of the body's second line of defense, and it is nonspecific. It includes the following steps:

Chemotaxis: A cell moves either toward or away from a chemical stimulus.

Adherence: The phagocyte attaches to the pathogen, through binding of complementary chemicals on the membranes of the pathogen.

Ingestion: After the pseudopodia adhere to the pathogen, the encompassed microbe is internalized as the pseudopodia fuse to form a sac called a phagosome.

Digestion: Lysosomes with over 30 digestive enzymes attach to the phagosome and break down the microbe. At the end of this process, the remains of the phagosome are known as the residual body.

Elimination: The phagocyte rids itself of undigested material by exocytosis, which is the opposite of ingestion.

Phagocytosis is the opposite of pinocytosis. 
Phagocytosuis is cellular eating - cells engulfing particles that are essential for their survival
Pinnocytosis is cellular drinking - cells taking in liquid that is also essential for their survival

My point exactly