The cell membrane holds both plant and animal cells together. It's a thin, flexible barrier that surrounds the entire cell, controlling what goes in and out.

Here's a little more detail:

* Cell Membrane (Plasma Membrane): This is the outer boundary of both plant and animal cells. It's made of a phospholipid bilayer, which acts as a selective barrier. This means it lets some substances pass through while keeping others out. This is crucial for maintaining the cell's internal environment and allowing for essential processes like nutrient uptake and waste removal.

While the cell membrane is the primary structure holding the cell together, there are other components that contribute to its integrity:

* Cell Wall (Plant Cells): Plant cells have an additional rigid outer layer called the cell wall. This provides structural support and protection.

* Cytoskeleton: This network of protein fibers helps maintain the cell's shape, provides internal support, and allows for movement of organelles within the cell.

Let me know if you'd like to learn more about any of these structures!