What does the Oxy-hemoglobin dissociation curve tell us?

Hint: One among the most functions of the blood is to hold oxygen throughout the body of an animal. This function is completed by the red blood cells or erythrocytes within the blood. The hemoglobin during which oxygen is absolute is mentioned as oxy-hemoglobin.

Complete answer:
The oxy-hemoglobin dissociation curve relates the shared saturation of hemoglobin with the partial pressure of oxygen (p$O_2$). It tells about the affinity of hemoglobin for oxygen. It may be accustomed to ascertain the results of p$CO_2$ and $H^+$ concentration on the binding affinity of hemoglobin for oxygen.
The oxy-hemoglobin dissociation curve shows how the hemoglobin saturation with oxygen ($SO_2$), is said to be the partial pressure of oxygen within the blood (p$O_2$). So each hemoglobin protein can bind 4 molecules of oxygen. But all hemoglobin isn't 100% saturated or bound by oxygen.
The oxygen dissociation curve plots the kid saturation against the partial pressure of oxygen, and its contribution to the full oxygen content. This is often an S shaped curve because of the alterations in hemoglobin's affinity for oxygen in response to other physiologic factors.
The oxygen dissociation curve may be a graph with oxygen partial pressure along the horizontal axis and oxygen saturation on the vertical axis, which shows an S-shaped relationship.

Note:
The link between the partial pressure of oxygen and also the binding of hemoglobin to oxygen is described by the oxygen–hemoglobin saturation/dissociation curve. Because the partial pressure of oxygen increases, the quantity of oxygen molecules bound by hemoglobin increases, thereby increasing the saturation of hemoglobin.