The process by which cells secrete cellular products into the extracellular environment is called exocytosis.

Here's a breakdown:

* Exocytosis is the process of moving substances out of a cell. It involves the fusion of a vesicle (a membrane-bound sac) containing the substance with the cell's plasma membrane. This releases the substance into the extracellular space.

There are two main types of exocytosis:

* Constitutive exocytosis: This occurs continuously and is responsible for the secretion of proteins and other molecules that are needed for the cell's normal functioning.

* Regulated exocytosis: This is triggered by a specific signal, such as a hormone or a neurotransmitter, and is responsible for the secretion of substances like hormones, neurotransmitters, and enzymes.

Let me know if you'd like to know more about exocytosis or its different types!