The space between the cell walls of plant cells is called the middle lamella.

Here's a breakdown:

* Cell Wall: The rigid outer layer of a plant cell that provides structure and support.

* Middle Lamella: A thin layer composed primarily of pectin, a sticky substance that helps cement adjacent cell walls together.

The middle lamella plays a crucial role in:

* Holding cells together: It acts as a glue, creating a strong and cohesive tissue.

* Cell-to-cell communication: It allows for the passage of molecules between cells.

* Plant growth and development: It helps regulate cell expansion and differentiation.