Plasma membranes and cell walls are two essential components of a cell, and they both play important roles in the overall function of the cell. The plasma membrane is the outermost part of the cell, and it serves as a barrier between the inside and outside of the cell. It is responsible for controlling what enters and exits the cell, and it is also involved in the communication between cells. On the other hand, the cell wall is the rigid outermost layer of the cell. It provides structural support to the cell, and it helps to protect the cell from environmental stresses like extreme temperatures or desiccation. Together, these two components of a cell are essential for its basic functions.

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source: Phys.org