Mechanic solidarity - we were all the same in society. We were all farmers, did the same thing every day, followed the same footsteps from generation to generations, for example, shared the same ideas. An example of today, if you worked in the steelworks, your child is expected to work there as well, and the line would continue.
Organic Solidarity - Interdependent. We rely on each other to do things. For example, if we work in a factory and one does the cutting out of the material, the other then sew it and then the other does something else. If one stops, the other falls apart, and so on.
Durkheim theory - doesn't help us think about power operates in society. It believes the wealthy are doing good and looking after the poor.