Question: What does temperature actually tell us about an object? Why do we care about temperature at all?
There are three main things that the temperature of an object tells us.
1) The temperatures' of a set of objects allows us to work out which object is hotter and which is colder. Once we know this we can apply our understanding of heating and cooling to work out how the temperatures of the two objects will change because we will know which way the heat energy will flow between the two objects.
2) The temperature of an object tells us what state the object is in and how close the object is to a change of state (boiling or melting).
3) The size of the temperature difference between two objects, the faster the rates of heating and cooling.