Plasmodesmata are microscopic channels that connect the cells of plants and some algae. These structures allow for the direct transport of water, nutrients, and signaling molecules between adjacent cells, facilitating communication and coordination within plant tissues. Each plasmodesma consists of a narrow tube of cytoplasm, known as the symplast, which is surrounded by the cell membrane. This connection enables cells to share resources and respond collectively to environmental changes, playing a crucial role in plant growth and development.