Final answer:
In the feudal system, the lowest class was the serfs who were bound to the land they worked. They were different from slaves because they had certain rights and privileges.
Step-by-step explanation:
In the feudal system, the lowest class was the serfs. These serfs were bound to the land they worked but were not considered slaves. They differed from slaves because they had certain rights and privileges. For example, they could not be bought or sold, and they could not own property. However, they were still the lowest class in society with limited rights and were subject to physical abuse by the lord.