Here's a breakdown:

* Vesicles: These are small, membrane-bound sacs within cells that transport substances.

* Fusion with the cell membrane: The vesicle's membrane merges with the cell membrane.

* Release of contents: The contents of the vesicle, which could be proteins, hormones, waste products, or other substances, are released outside the cell.

Exocytosis is a crucial process for many cellular functions, including:

* Secretion of hormones and neurotransmitters: Cells like endocrine cells and neurons use exocytosis to release their signaling molecules.

* Transport of waste products: Exocytosis helps rid the cell of unwanted materials.

* Cell growth and repair: Exocytosis plays a role in adding new membrane components to the cell surface.

Let me know if you'd like more details about any of these aspects!