Have the same temperature.

This means that there is no net flow of heat between them. Here's why:

* Temperature is a measure of the average kinetic energy of the particles within an object. When objects have the same temperature, their particles are vibrating with the same average kinetic energy.

* Heat flows from a region of higher temperature to a region of lower temperature. This is because the particles in the hotter region have higher average kinetic energy and are more likely to collide with and transfer energy to the particles in the cooler region.

* At thermal equilibrium, the rate of heat transfer between the objects is equal in both directions. This means that the objects are exchanging heat at the same rate, and there is no net change in temperature.

Let me know if you have more questions about thermal equilibrium!