The term "septum" refers to a dividing wall or partition within a biological structure. In humans, the most well-known septum is the nasal septum, which separates the left and right nostrils. Another important septum is the interventricular septum in the heart, which divides the left and right ventricles, ensuring that oxygen-rich and oxygen-poor blood do not mix. Septums can also be found in other organisms and structures. For example, in plants, a septum can refer to the partitioning within a fruit or seed pod. In general, septums play a crucial role in maintaining the organization and function of various biological systems.