Here's a breakdown:

* Phagocytosis is a type of endocytosis where a cell engulfs large particles, such as bacteria, viruses, or cellular debris, by surrounding them with its plasma membrane and internalizing them within a membrane-bound vesicle called a phagosome.

* Endocytosis is a general term for the process of a cell taking in material from its surroundings by engulfing it in a membrane-bound vesicle.

* Exocytosis is the opposite process, where a cell releases material from inside itself by fusing a vesicle with its plasma membrane.

Let me know if you'd like more detail on any of these terms!