Here's a breakdown:

* Phagocytosis: The process where a cell engulfs large particles like bacteria, viruses, or cellular debris.

* Phagosome: The membrane-bound vesicle formed when a cell engulfs material during phagocytosis.

* Lysosome: An organelle within the cell containing digestive enzymes.

* Phagolysosome: The structure formed when a phagosome fuses with a lysosome. This fusion brings the digestive enzymes of the lysosome into contact with the phagocytized material.

Within the phagolysosome, the enzymes break down the material into smaller molecules that can be used by the cell or excreted.