Here's a breakdown:

* Phagocytosis comes from the Greek words "phagein" (to eat) and "kytos" (cell).

* It's a process where a cell engulfs a solid particle, forming a vesicle called a phagosome.

* This is a key process for immune cells like macrophages, which engulf bacteria, viruses, and cellular debris.

* It also plays a role in normal cellular function, like removing damaged cells and cellular waste.