definition of internal and external customer

1)internal customers are people related to your company eg. different divisons or departments , where, external customers are unrelated to your organization
2)internal customers- since under same organization, therefore, should create synergies which could drive down cost of sales
external customer- no synergies but genearte new money , therefore, good for cash flow and create reputation
3)internal- since under one umberalla, have mutual understanding and techical know how, therefore, should have a smooth transaction. As a result, our attitude should like working with colleges
external-no understanding of your business, and no technical know how, therefore, can charge higher money. As a result, our attitude should be more like an insider treatment an outsider