Final answer:
John D. Rockefeller and Andrew Carnegie are described as leaders in the steel and oil industries, sometimes classified as 'Robber Barons,' and known for generous philanthropy.
Step-by-step explanation:
The common descriptions of John D. Rockefeller and Andrew Carnegie are related to their vast enterprises in the steel and oil industries, their classification as "Robber Barons", and their significant philanthropic contributions. Specifically, Andrew Carnegie is synonymous with the steel industry, having risen from humble origins to dominate the U.S. steel market. Both men were known for creating powerful trusts and monopolies during the late 1800s, with Rockefeller's Standard Oil and Carnegie's Steel Factory being prime examples.